Hp Sure Store

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hp surestore auto path

virtual array

for Windows NT

installation and users guide

Version 1.03

Edition August 2001

Printed in U.S.A.


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2

Notice

Hewlett-Packard Company, 2001. All rights reserved.

Hewlett-Packard Company makes no warranty of any

kind with regard to this material, including, but not

limited to, the implied warranties of merchantability and

fitness for a particular purpose. Hewlett-Packard shall not

be liable for errors contained herein or for incidental or

consequential damages in connection with the furnishing,

performance, or use of this material.

This document contains proprietary information, whichis protected by copyright. No part of this document may

be photocopied, reproduced, or translated into another

language without the prior written consent of

Hewlett-Packard. The information contained in this

document is subject to change without notice.

Safety Instructions

Denotes:

WARNING A hazard that can cause personal

injury

Caution A hazard that can cause hardware or

software damage

Note Significant concepts or operatinginstructions

Trademark Information

Microsoft, Windows NT, and Windows 2000 areregistered trademarks of Microsoft Corporation

Java and all Java-based marks are trademarks or

registered trademarks of Sun Microsystems, Inc. in

the United States and other countries.

HP, is a registered trademarks of Hewlett-Packard

Company.

Command View, Secure Manager, Business Copy,

Auto Path, Smart Plug-Ins are trademarks of

Hewlett-Packard Company

Format Conventions

literal Specifies text to be typed exactlyas shown, such as commands,

path names, file names, and

directory names.

variable Indicates that you must supply a

value.

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one of the listed options.

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3

1 Auto Path features 5Auto Path description 6

Dynamic load balancing 7

Automatic failover and recovery 8

System requirements 9

Product Contents 10

Auto Path VA Upgrade Licenses 11

HP Modular Storage Software Products 11

Warranty 13

Technical Support 13

2 Installation 15Installing Auto Path software 16Uninstalling Auto Path 17

3 Operation 19Configuring Auto Path using the graphical user interface 20

Navigation 22Servers window 24

Adding a server 26

Deleting a server 27

Refreshing the window 28

Diagnostic message panel 29

Server Settings window 31

CONTENTS


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4

Accessing Auto Path help 32

About window 33

Server Details window 34

Disk Arrays window 36

Devices window 37

Adding new devices and paths 39

Device Settings window 40

Setting the load balancing policy 42

Setting the preferred path 44

Path Performance window 46Saving chart settings 49

Opening and restoring chart settings 50

Removing a plot from the chart 51

Changing settings 52

Adapters window 53

AdapterPathInfo window 55

Using Windows Performance Monitor 57

4 Command-line interface 59autopath adapters 60

autopath devices 61

autopath help 62

autopath paths device 63

autopath set device 64

5 Troubleshooting 65Recovering after a failure 66

Troubleshooting 67

Contacting HP customer service 68

Index 69


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5

AUTO PATH FEATURES

HP Auto Path provides automatic input/output (I/O) path failover and load

balancing for host systems configured with multiple host adapters and

connections to a disk array.

Auto Path provides these features:

enhanced data availability

automatic path failover to an alternate path and path recovery

dynamic load balancing over multiple paths

both a graphical user interface (GUI) and a command-line interface

(CLI)

The GUI provides enhanced features, such as path performance windows.


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6 HP Auto Path XP: Users Guide (Windows NT/2000)

Auto Path description

The HP Auto Path software performs dynamic load balancing of data flow

through multiple paths. It detects multiple paths to each logical device and

distributes the data load among the paths for optimum performance. It

automatically detects path failures and switches to alternate paths and also

recovers the failed paths after they are restored.

The user interface lets a system administrator define load balancing policies

and preferred paths, and view device path information. Auto Path managespaths according to the balancing policy, ensuring that no single path is a

performance bottleneck.

Normally, disk I/O is sent directly to the disk driver. Auto Path is a filter

driver that fits between the Windows disk driver and the host bus adapter

(HBA) driver (figure 1). Auto Path is transparent to the Windows operating

system and to the applications running on a server.

Figure 1. I/O Flow

The Auto Path GUI consists of two software components:

server

The server component runs on the host that is connected to the disk

array.

client

The client can run either on the host or from a remote PC connectedthrough the network.

System disk I/O Windows disk driver Auto Path Adapter driverdriver LUN


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Auto Path features 7

Dynamic load balancing

Auto Path performs dynamic load balancing while monitoring each path to

ensure that the I/O transaction is completed. The load balancing policy is

selected by the administrator.

The dynamic load balancing policy prevents any path from becoming

overloaded, and it helps to prevent the congestion that occurs when many

I/O operations are directed to common devices along the same path.

If a preferred path is used for a device, the entire I/O for that particular

device flows through the preferred path. No load balancing is done by Auto

Path for that device.


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Automatic failover and recovery

In the event of a failure of any part of a path between the disk array and a

server, Auto Path automatically switches to an alternate path, dropping the

failed path out of the I/O rotation without any loss of data. The failover is

not visible to applications, so normal operation continues, without

downtime. After the paths are restored, they are automatically detected and

used for I/O.

All path changes are logged in the Windows Event Viewer log. Servicepersonnel can use the log to investigate and repair failed paths.

For troubleshooting information, see Troubleshooting (page 67).


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System requirements

To install Auto Path, the system must conform to these requirements:

Windows NT with service pack 6

30 MB of local disk space available on the Windows NT system

administrator access to the Windows NT system

preformatted devices on the attached disk array for recognition and

use by Auto Path and Windows NT

1024 x 768 minimum display resolution

For specific installation requirements for your system, contact your HP

account representative.

Additional

Information

Support information about host bus adapters (HBA) driver pairs is in the

README.txt file on the Auto Path installation CD-ROM. If your HBA isnot listed, contact your HP account representative.


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Product Contents

The contents of the Auto Path VA product include:

HP StoreStore Auto Path Virtual Array Installation and Users Guide

Software CD

1 Host License-to-Use Certificate

Installation and Users GuideSoftware CD

License-to-UseCertificate


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Auto Path VA Upgrade Licenses

A one host license-to-use is required for each installation of Auto Path VA.Upgrade licenses provide additional host usage for the Auto Path VA product.

These upgrade licenses can increase the host usage up to 25 hosts, depending on

the license purchased (see Table 1 on page 12). The contents of the upgrade license

include:

Software License Certificate

Storage envelope

Note Keep all Software License Certificates you receive for the HP

SureStore Auto Path Virtual Array product in a safe place.

The HP SureStore Auto Path Virtual Array product is licensed to you

according to the standard licensing terms defined on the HP Software

License Agreement you received with this product.

HP Modular Storage Software Products

Several optional software products are available to enhance the operation of the HP

SureStore Virtual Array. These optional software products are listed in the

following table. For the most up-to-date product information, access the HP Website.

Software License Certificate


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Table 1 HP Modular Storage Software Products

Software Product HP Sales Rep. HP Reseller

Command View SDM

Storage device management enables array configuration and

management and provides value-added software products.

Software Package and 1 Host License-to-Use (LTU) T1001A T1020A

Enterprise Management Smart Plug-Ins

Enables Command View SDM in HP OpenView NNM, BMC Patrol,

CA-Unicenter TNG, and Tivoli Netview.

Software Package and 1 Host LTU T1002A T1021A

Business Copy Virtual Array

Enables online data replication or LUN copying within the array for

testing and backup, and requires the same physical space to be

available in the array as the LUN(s) being copied.

Software Package and 50 GB LTU500 GB Upgrade LTU

1 TB Upgrade LTU

T1007AT1008A

T1009A

T1026AT1027A

T1028A

Secure Manager Virtual Array

Enables LUNs to be locked into a secure shared environment.

Software Package and 50 GB LTU

500 GB Upgrade LTU1 TB Upgrade LTU

T1003A

T1004AT1005A

T1022A

T1023AT1024A

Auto Path Virtual Array for Windows NT

Enables I/O path fail-over in Windows NT environments with the

benefit of I/O load balancing in both failed and non-failed states.

Software Package and 1 Host LTU

1 Host Upgrade LTU

5 Host Upgrade LTU

10 Host Upgrade LTU

25 Host Upgrade LTU

T1039A

T1040A

T1041A

T1042A

T1043A

T1049A

T1050A

T1051A

T1052A

T1053A


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Warranty

This software package comes with a 90 day media defect warranty. If you have anyproblems with the quality of the CD or the supporting documentation, you can

return it for exchange through any HP sales office or authorized HP reseller.

Technical Support

Technical support is provided for this product through an HP Support Contract,

purchased at the time you purchased this product. See the HP Support Contract for

information on technical support.

For a list of the most current support phone numbers for the HP SureStore Auto

Path Virtual Array product, go to the following HP Web site:

www.hp.com/go/apva


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15

INSTALLATION

Auto Path is installed using an automated installation program. After Auto

Path is installed, and the server software component is running on the host,

Auto Path is accessible from a networked PC where the client software is

installed.


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Installing Auto Path software

To install Auto Path, you must have administrator privileges on thehost PC.

Caution Read the readme.txt file on the installation media for more details about

installation.

To install Auto Path:

1. Log on as administrator.

2. Insert the Auto Path installation CD into a local CD-ROM drive (for

example, drive D:).

3. If Autorun is enabled on the PC, the Auto Path installation window

appears, and you can follow the instructions to complete the installation.

4. If Autorun is not enabled, select Start Run.

5. Browse to the setup.exe file or enter D:\setup\setup.exe in the text box

(where D: is the drive letter for the CD-ROM drive).

6. Click OK to begin the installation.

The Auto Path installation window appears.

7. Follow the on-screen instructions to complete the installation.

The Auto Path Remote Access Server can either be installed as a

command line or as a Windows service.


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Installation 17

Uninstalling Auto Path

To uninstall Auto Path, use the Windows Control Panel.

To uninstall Auto Path:

1. Open the Windows Control Panel.

2. Open Add/Remove Programs.

3. Select Auto Path.

4. Click the Add/Remove button.

5. Follow the on-screen instructions to uninstall the Auto Path program

files.


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19

OPERATION

Auto Path operations can be accessed from both a graphical user interface

(GUI) and command line interface (CLI). Both the GUI and the CLI can be

used to display information about the logical devices on an attached disk

array and their associated I/O paths. The administrator can use the interface

to change the load balance policy or the preferred path to a device.


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Configuring Auto Path using the graphical user interface

After installing Auto Path, you can start the Auto Path graphical userinterface (GUI) program. To start the Auto Path GUI program, you must

have administrator access to the server.

To use the interface, you must start both the user-interface server and client

GUI. Depending on the options that you selected during the installation,

you can start the server and client using either an icon on the Windows

desktop or from the Windows Start menu.

If you want to use the command line interface to configure Auto Path, see

Command-line interface (page 59).

To start the Auto Path user-interface server:

1. If you have Auto Path icons on your Windows desktop, select the icon

labeled Start HP Auto Path Server.

2. If you do not have the Auto Path icons on your Windows desktop, select:

Start Programs HP Auto Path Start Auto Path Server

A command window appears.

If the user-interface server is installed as a Windows service, the server is

started automatically.

To start the Auto Path client GUI:

1. If you have Auto Path icons on your Windows desktop, select the icon

labeled Start HP Auto Path Client.

2. If you do not have the Auto Path icons on your Windows desktop, select:

Start Programs HP Auto Path Start Auto Path Client


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Operation 21

The Servers window opens.

Example

If this is the first time that Auto Path is opened after installation, the

window shows localhost server by default. To add servers to the program,

use the Add New Server window. See Adding a server (page 26).


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Navigation

The Auto Path GUI configuration windows feature a navigational treestructure that shows the distribution of servers, disk arrays, adapters, and

devices in the system. At startup, the tree is automatically populated.

Example

Tree structure functionality

Servers Root of the hierarchy that contains all configuredservers as nodes. Select a server to display the Serverswindow; see Servers window (page 24).

Server nodes Expand a server node to show DiskArrays andAdapters.

DiskArrays Node that contains disk arrays on the parent server.

Select to display the Disk Arrays window; see DiskArrays window (page 36). Expand to show disk arraynodes.

Disk Array nodes Disk array nodes are identified by disk array names.Select to display the Devices window; see Deviceswindow (page 37). Expand to show devices in the diskarray unit.


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Operation 23

Device nodes Device nodes are identified by device names. Select todisplay the Device Settings window; see DeviceSettings window (page 40).

Adapters Node that contains adapters on the parent server. Selectto display the Adapters window; see Adapterswindow (page 53). Expand to show adapter nodes.

Adapter nodes Adapter nodes are identified by adapter names. Selectto display the AdapterPathInfo window; seeAdapterPathInfo window (page 55).


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Servers window

Auto Path opens with the Servers window. This window shows the namesof the servers and the status of the Auto Path software on them. At startup,

the tree in the left panel is automatically populated.

To access this window, select Servers, the root of the tree structure.

Example

The Servers window displays server information:

Server # An index number used by Auto Path for identifying theserver.

Server Name The server name.


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Operation 25

Status The status of the server:

Auto Path Server Up The target server is

operational.

Auto Path Server Down The target server is down orit is not running the AutoPath GUI server.

Auto Path Driver Not The Auto Path driver is not

Functioning running on the target server.

Status update in The update of the Auto Pathprogress Server status is in progress.


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Adding a server

You can add a new server to the list of available servers for Auto Path byusing the Add New Server dialog box.

To add a server:

1. From the Servers window, select Add New Server from the File drop-

down menu

The Add New Server dialog box opens.

Example

2. In the Server Name box, type the server name or the IP address for the

server you want to add.

3. Select Add.

The server name is added as a node on the Servers tree in the left panel

of the Servers window. The corresponding server information is

displayed in the right panel.


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Operation 27

Deleting a server

You can delete a server from the list of available servers for Auto Pathusing the Delete Server dialog box.

To delete a server:

1. From the Servers window, select Delete Server from the File drop-down

menu.

The Delete Server dialog box opens.

Example

2. From the Select Server drop-down box, select the server name of the

server you want to delete.

3. Select Delete.

The node of the selected server is deleted from the Servers tree in the

left panel of the Servers window. The corresponding server

information is removed from the right panel.


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Refreshing the window

The View drop-down menu allows you to refresh the display to show thecurrent state of the selected server/devices. Select Refresh.

Example


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Operation 29

Diagnostic message panel

The main window provides a diagnostic message panel that displays errormessages periodically for the active (selected) server. The error message

panel is located in the bottom right portion of the window.

Example

The error messages are color coded:

red A connection to a server has been lost, or adevice/path has disappeared.

green A connection to a server is established, or a

device/path has come up.


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Error Log File

For the default installation, error messages are recorded in an Auto Path log

file:

\hpss\Auto Path\data\autopath.log

Set the log file size through the Set Log File Size command on the Options

menu.

Example


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Operation 31

Server Settings window

Use the Server Settings window to change the update times for the serverstatus, device data, and path performance data.


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Accessing Auto Path help

Use the Help drop-down menu to access Auto Path help.

Example


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Operation 33

About window

The About window displays the HP Auto Path version number.


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Server Details window

The Server Details window shows the disk arrays and adapters connected tothe selected server. This window is a view-only window; there are no user-

configurable functions.

To access the Server Details window, select the node of a server in the tree

view. The content of the window depends on the connection status of the

selected server.

Successful server connection

If the client is able to connect to the server, the DiskArrays and Adapters

folders appear in the main portion of the window.

Example

DiskArrays A folder equivalent to the DiskArrays node in the treeview. Select to display the Disk Arrays window; seeDisk Arrays window (page 36). The tree viewexpands to the level of the disk array nodes.


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Operation 35

Adapters A folder equivalent to the Adapters node in the treeview. Select to display the Adapters window; seeAdapters window (page 53). The tree view expands

to the level of the adapter nodes.

Failed server connection

If the client is not able to connect to the server, the main portion of the

window appears empty. The status bar at the bottom of the window displays

a message:

Failed to connect to the server.

Example


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Disk Arrays window

The Disk Arrays window shows the details of the disk arrays connected tothe selected server. This window is a view-only window; there are no user-


To access the Disk Arrays window, select the Disk Arrays node of a server

in the tree view.

Example

The Disk Arrays window displays disk array information:

Disk Array # An index number used by Auto Path for identifying the

disk array.

Disk Array Name The serial number of the disk array.

# of Devices The number of devices on the disk array.


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Operation 37

Devices window

The Devices window displays the devices for the selected disk array. Thiswindow is a view-only window; there are no user-configurable functions.

To access the Devices window, select a disk array node in the tree view.

Example

The Devices window displays device information:

Device# An index number used by Auto Path for identifying thedevice.

Device Name The device name.

Serial# The logical device serial number.

St t Th t t f th d i


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State The state of the device:

Active The device is in use.

Failed The device is not in use or all pathsto the device have failed.

# of Paths The number of active paths attached to the device.

Load Balance PolicyThe policy currently selected for the device.

Preferred Path # For devices with no load balancing policy, this indicatesthe selected preferred path.


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Operation 39

Adding new devices and paths

Windows NT

When you add a new device or a new path to an existing device, you must

run Windows Disk Administrator so that Auto Path can recognize it.

To recognize new devices or paths in Auto Path:

1. Start Windows Disk Administrator by selecting

Programs Administrative Tools Disk Administrator from theWindows Start menu.

2. After Disk Administrator is fully initialized and execution is finished,

you must refresh the Auto Path GUI. Return to the Devices window and

select Refresh from the View menu.

The new device or path is displayed in the Devices window.

3. Close Disk Administrator.


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Device Settings window

The Device Settings window shows the paths to a device and its loadbalance policy and preferred path to the device in case of

No_Load_Balance policy.

Access this window by selecting a device node in the tree structure.

Example

The Device Settings window displays device information:

Load Balancing PolicyDisplays the load balancing policy for the device. The

drop-down list lets you choose from a list of policies.See Setting the load balancing policy (page 42).

Preferred Path Number(Displayed only when the current Load BalancingPolicy is No Load Balancing.) Displays the indexnumber of the preferred path for the device. Select thepreferred path to a device from the drop-down list.

Path # The index number for the path.


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Operation 41

Path # The index number for the path.

State The state of the path:

Active The path to the device is available forI/O.

Failed The path to the device is not availablefor I/O.

Controller Port # The port number of the controller on the disk array to

which the device is connected.

Port.Bus.Target.LUNDisplays the physical path identifier.

Set Applies the changes.

Cancel Cancels the operation.

Path Performance Allows you to create and view performance graphs ofthe paths to the device; see Path Performancewindow (page 46).


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Setting the load balancing policy

The Device Settings window lets you set the load balancing policy for aselected device.

All of the load balancing policies determine their actions based upon the

current queue depths of all of the paths available to the device. The only

difference between policies is how the queue depth is measured. All of the

policies, except Round Robin, tend to shift the I/O load from heavily loaded

paths or resources to more lightly loaded ones. If the average number of

requests outstanding to the device tends to be small, then all of the policies

behave like the Round Robin policy.

You can select from these load balancing policy options:

No Load BalancingNo load balancing performed. All I/O is routed through

the preferred path. See Setting the preferred path(page 44).

Default Balance PolicySame as Shortest Queue Service Time.

Round Robin The requests are cycled through each path sequentiallywithout regard to queue depth.

Shortest Queue RequestsMeasures the current queue depth by counting thenumber of requests outstanding for each path.

Shortest Queue BytesMeasures the current queue depth by the sum of the

sizes of the I/O requests outstanding on that path.

Shortest Queue Service Time(Default) Measures the current queue depth by the sumof the length of time each I/O request has beenoutstanding on that path.

To set the load balancing policy:


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Operation 43

1. From the tree view, select the server, disk array, and device that you

want to set the load balancing policy for.

The Device Settings window opens (see page 40).

2. Select the load balancing policy from the Load Balancing Policy drop-

down list.

The new load balancing policy is displayed.

3. Select Set.

The load balancing policy is applied.

S tti th f d th


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Setting the preferred path

The Device Settings window lets you set the preferred path when you haveno load balancing policy for a selected device.

If the current policy is not No Load Balancing, set the Load Balance Policy

to No Load Balancing for the device for which you want to set a preferred

path.

To set the preferred path:

1. From the tree view, select the server, disk array, and device that you

want to set the preferred path for.

The Device Settings window opens (see page 40).

2. Select the Preferred Path from the Preferred Path Number drop-down

menu.

The new Preferred Path is displayed. If the selected Preferred Path isdifferent from the Current Preferred Path, the OK button is enabled.

Example

3. Select Set.


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Operation 45

The no load balancing policy and preferred path are applied.

Path Performance window


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The Path Performance window allows you to create and view performancecharts for selected paths of a device. The charts can be used to evaluate load

balancing policy or preferred paths.

To access the Path Performance window, select the Path Performance

button in the Device Settings window. The Path Performance window

opens separately from the main Auto Path window.

To close the window, select Exit from the File menu.

Example

Path performance chart

The chart contains plots based on the selected parameters. The y-axis is the

measure for the selected performance counter; the x-axis represents time.

To change the vertical maximum of the chart, see Changing settings

(page 52).

Chart parameters


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Operation 47

Paths Drop-down box that is used to select the index numberof a path to be charted.

Counter A list of available counters, measured on the y-axis ofeach chart. Choices are:

% Disk Read Time% Disk Write Time% Disk Time

% Idle TimeDisk Read/secDisk Writes/secDisk Transfers/secCurrent Disk Queue LengthDisk Bytes/SecDisk Read Bytes/SecDisk Write Bytes/Sec

Scale Drop-down box that is used to select the scale of thechart.

Set Starts the plotting of the chart as per the selectedparameters.

Chart settings information

Path # The previously determined index number of the plottedpath, followed by its SCSI address:[Port.Path.Target.LUN].

Multiple plots, using different counters, can begenerated for the same path.

Counter The selected counter for the plot.

Scale The selected scale for the plot.

Color The color of the plot.

Device settings controls


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Load Balancing PolicyDisplays the load balancing policy for the device. Thedrop-down list lets you choose from a list of policies;see Setting the load balancing policy (page 42).

Preferred Path Number(Displayed only when No Load Balancing is selected

for Load Balancing Policy.) Displays the index numberof the preferred path for the device. Select the preferred

path to a device from the drop-down list.

Set Applies the changes.

Cancel Cancels the operation.

If the Path Performance window is open, the Load Balancing Policy and

Preferred Path Number choice boxes for that device in the main window

(Device Settings) are disabled.

Saving chart settings


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Operation 49

Saving chart settings

You can save the settings of a chart for future use using the Save ChartSettings option.

To save chart settings:

1. Select Save Chart Settings from the File menu.

The Save Chart Settings window appears.

Example

2. Enter a filename with the extension .app.

3. Select Save.

The chart settings are saved for future use. To open a chart settingsfile, see Opening and restoring chart settings (page 50).

Opening and restoring chart settings


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p g g g

You can restore previously saved chart settings by opening a chart settingsfile. To create a chart settings file, see Saving chart settings (page 49).

To open a chart settings file:

1. Select Open from the File menu.

The Open Chart Settings File window appears.

Example

2. Select the desired chart settings file. Chart settings files use the

extension .app.

3. Select Open.

The chart settings are restored.

Removing a plot from the chart


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Operation 51

g p

You can remove an unwanted plot from the chart using the Delete FromChart option.

To delete a plot from the chart:

1. Select the Path # of the plot you want to delete.

2. Select Delete From Chart from the Edit menu.

Example

The plot is removed from the chart.

Changing settings


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You can change the vertical maximum of a chart using the Chart Settingsdialog box.

To change the vertical maximum of a chart:

1. Select Chart Settings from the Options menu.

The Chart Settings window opens.

Example

2. Enter the vertical maximum.

3. Select OK.

The new vertical maximum is applied.

Adapters window


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Operation 53

The Adapters window lists all the Auto Path-capable adapters on the

system. This window is a view-only window, and there are no user-


Example

The Adapters window displays adapter information:

Adapter # An index number used by Auto Path for identifying theadapter.

Adapter Name The name of the adapter.

Adapter State The state of the adapter:

Active The adapter is in use.

Failed The adapter has failed.

# of Paths The number of paths through the adapter.

Adapter SCSI Port #


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Adapter SCSI Port #The adapter SCSI port number.

AdapterPathInfo window


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Operation 55

The AdapterPathInfo window shows the details of the various paths

through the adapter. This window is a view-only window; there are no user-


To access the AdapterPathInfo window, select an adapter under the

Adapters node in the tree view.

Example

The AdapterPathInfo window displays path information:

Path # An index number used by Auto Path for identifying thepath.

Path State The state of the path:

Active The path to the device is available


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Active The path to the device is availablefor I/O.

Failed The path to the device is notavailable for I/O.

Port.Path.Target.LUNDisplays the physical path identifier.

Device Name The name of the device that the path leads to.

Device Serial # The serial number of the device that the path leads to.

Using Windows Performance Monitor


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Operation 57

Windows Performance Monitor also allows you to create and view

performance charts for selected paths of a device. The charts can be used to

evaluate load balancing policy or preferred paths.

To create a path performance chart using Performance Monitor:

1. Start Windows Performance Monitor by selecting

Programs Administrative Tools Performance Monitor from the

Windows Start menu.The Performance Monitor window opens.

2. Select Add to Chart from the Edit menu.

The Add to Chart window appears.

3. Select HP Auto Path from the Object drop-down list.

The Instance box shows the paths to the devices on the disk arrays.The Counter box shows the list of counters.

4. To view descriptions of the available counters, click Explain.

5. Select the paths and counters that you want to view the performance

details for.

6. Select Add.

The program begins plotting the chart.


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59

COMMAND-LINE INTERFACE

The Auto Path command-line interface (CLI) can be used only on hosts

connected to multipath-capable devices with the Auto Path driver installed.

The commands supported by this interface and the syntax are described

here:

autopath adapters (page 60)

autopath devices (page 61)

autopath help (page 62)

autopath paths device (page 63)

autopath set device (page 64)

You can execute Auto Path commands only from the directory where the

installed Auto Path program files reside.

To exit the DOS window, use the exit command.

If you chose the default directory when you performed the installation,

change the directory to C:\hpss\AutoPath, and then execute Auto Path

commands. If you chose a different directory during installation, change the

directory to the one you specified, and then execute Auto Path commands.

autopath adapters

autopath adaptersDisplay adapter names


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Syntax autopath adapters

Description The autopath adapters command is used to display the various adapters inthe system.

Example HP Auto Path> autopath adapters

Adapter# Port# Adapter Name State # Paths1 2 HP HHBA5100x510xPCI Active 102 4 HP HHBA5100x510xPCI Active 4

autopath devices

autopath devicesDisplay devices


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Command-line interface 61

Syntax autopath devices

Description The autopath devices command displays the details of the multipath-capable devices in the system.

Example

HP Auto Path> autopath devicesDevice # Device Name Serial No. State #Paths Policy1 HP OPEN-3 0400756000E2 Active 2 Shortest_Queue_ServiceTime2 HP OPEN-3 0400756000E3 Active 2 Round Robin

autopath help

autopath helpDisplay help


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Syntax autopath help

Description The autopath help command opens the help for the autopath command-line interface supported commands.

Example

HP Auto Path> autopath helpDisplays details of HP Auto Path software supported devices/adaptersAUTOPATH DEVICES : Displays details of devicesAUTOPATH PATHS DEVICE=# : Displays details of paths to device#

(* at the end of a path signifies that it is thepreferred path)

AUTOPATH SET DEVICE=# PATH=# : Sets preferred path to device# as path#AUTOPATH ADAPTERS : Displays details of adaptersAUTOPATH SET DEVICE=# POLICY= : Sets load balance policy for device#

to


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Command-line interface 63

Description The autopath paths device command displays the paths to the selecteddevice referenced by the device number.

Syntax autopath paths device=device_number

device_number The Auto Path index number shown in the autopathdevices command line display.

Example The device for this example has a defined load balancing policy.

HP Auto Path> autopath paths device=1Device Name: HP OPEN-3Device Serial Number: 0400756000E2Path# Controller Port# State Scsi Port# Bus# TID Lun#-------------------------------------------------------------------------

1 6 Active 3 4 0 02 22 Active 3 4 1 0

autopath set device

autopath set deviceSet load-balancing policy or preferred path


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Syntax autopath set device=device_number{ policy=policy_name |path=path_number}

device_number The Auto Path index number shown in the autopathdevices command line display.

policy_name The load balancing policy name. For a list of load

balancing policies, see Setting the load balancingpolicy (page 42).

path_number The preferred path number.

Description The autopath set device command sets the load balance policy for thedevice specified by the device number.

If no load balancing is set for a device, the autopath set device command

sets the preferred path to the device.

Examples

HP Auto Path> autopath set device=1 policy=round_robinDevice Name: HP OPEN-3

Device Serial No. : 0400756000E2Change Load Balance policy (y/n) ? yLoad Balance policy changed. Verify by issuing "autopath" command

HP Auto Path> autopath set device=1 path=2Device Name: HP OPEN-3Device Serial No. : 0400756000E2Controller Port No. : 22Path Scsi Address : 3.4.1.0Change Preferred Path (y/n) ? yPreferred Path changed. Verify by issuing autopath command


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TROUBLESHOOTING

Troubleshooting can be performed by the customer or an HP service

representative, depending on your HP service contract. If you are unable to

resolve an error condition, ask your HP service representative for

assistance.

Recovering after a failure

When a path fails, it is no longer used by Auto Path. After the path is


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p , g y p

returned to normal, Auto Path automatically begins using the path with the

designated load balancing policy. No user action is necessary.

If there is no load balancing policy set for a failed path and the path was not

set as the preferred path, no user action is necessary.

If there is no load balancing policy set for a failed path and the failed path

was the designated preferred path, you must reset the recovered path as thepreferred path using the Device Settings window. See Setting the preferred

path (page 44).

Troubleshooting

To troubleshoot Auto Path, you can use these troubleshooting tools:


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Troubleshooting 67

y g

Event Viewer

The Event Viewer logs path failovers/recovery, disk and adapter

errors, and I/O errors.

Windows Diagnostics

The Administrative Tools utility, accessed from the Windows Control

Panel, shows all devices connected to the Windows system.

Windows Registry

Caution Back up the Registry before executing the Registry Editor.

The Registry shows the devices connected to the Windows system.

The Registry Editor can be used to display the devices seen at boot

time.

Disk Administrator

Disk Administrator shows the paths that are online and offline. If all

the paths to a LUN appear to be offline, it is likely that the device is

not preformatted at the disk array level. Preformat the device, and the

Disk Administrator will see the path of the device and the remaining

paths offline.

Contacting HP customer service

If you call HP customer support, provide as much information about the


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problem as possible, including the circumstances surrounding the error or

failure and the exact content of any error messages displayed on the host

system.


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INDEX

AAbout window

description33

AdapterPathInfo window

description55

Adapters window

description53

autopath adapterssyntax description60

autopath devices

syntax description61

autopath help


autopath paths device


autopath set device


CChart Settings dialog box

description52

DDevice Settings window

description40

devices

adding39

Devices windowdescription37

refreshing information28

Diagnostic Message panel

description29

Disk Arrays window

description36

Eerrors

diagnostic message panel29

log file30

F

failoverautomatic8

Ggraphical user interface

starting20

HHBA

supported driver pairs9

help

accessing32

HP customer service

contacting68

Iinstallation

deinstalling17

procedure16

i 9

starting Auto Path GUI

how to20

T

bl h i


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requirements9

Lload balancing

description7

load balancing policy

list42

setting42

Ppath performance chart

opening and restoring settings50

saving settings49


description46paths

adding39

setting preferred44

Rrecovery

actions needed66

SServer Details window

description34

Server Settings window

description31

serversadding26

deleting27

Servers window

description24

troubleshootingHP customer support68

Wwarranty13

windows

About33

AdapterPathInfo55Adapters53

Device Settings40

Devices37

Disk Arrays36

Path Performance46

Server Details34

Server Settings31

Servers24

Windows Performance Monitor

using57

Date post:	14-Apr-2018
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