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Managing Host Access to Storage

Upon completion of this module, you should be able to:• Explain Access Logix functionality• Explain LUN masking and mapping• Identify initiator and connectivity information• Managing storage groups

Managing Host Access to Storage 1

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Managing Host Access to Storage

This lesson covers the following topics:• Access Logix definition and functionalities• LUN Masking and Mapping

Lesson 1: Access Logix

2Managing Host Access to Storage

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Access Logix

• Host Access to Data• Create Storage Groups

Factory Installed Feature

• One or more LUNs or metaLUNs

• Access to LUNs only is a Storage Group

Storage Groups

• Cannot be disabledRun within VNX OE

Managing Host Access to Storage 3

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Access Logix Functionality

• Multiple Host Connections to an Array Exclusive access to storage resources Presents a ‘Virtual Storage System’

• LUN masking• Maps VNX LUNs to host LUNs• Access Logix Database

Manages the Access Control List Manages Initiator Registration Records

Managing Host Access to Storage 4

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LUN Masking and LUN Mapping

Physical Storage Array

Access Logix Database

Virtual Storage Systems Storage Groups

Server A

ALU 7

ALU 6

ALU 5

ALU 4

ALU 3

ALU 2

ALU 1

ALU 0

Server B

Storage Group A

Storage Group B

Access Control

List

HLU 0

HLU 1

HLU 2

HLU 3

Access Control

List

HLU 0

HLU 1

HLU 2

HLU 3

LUN 0LUN 1LUN 2LUN 3

LUN 0LUN 1LUN 2LUN 3

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Access Logix Limits

• Host may be in 1 storage group per storage system• Maximum of 4 storage systems per host• Number of hosts per storage system is model dependent• A storage group is local to 1 storage system• Maximum number of LUNs in a storage group is model

dependent• Host agent (optional) provides LUN mapping• User must be authorized to manage Access Logix

Privileged User list or Navisphere Security file

Managing Host Access to Storage 6

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Access Control Lists: Fibre Channel

• LUN UID - 128 bits Globally unique will never be re-used Example:

60:06:01:60:1E:40:33:00:69:6A:0A:80:D1:0A:E3:11

• Host HBA WWN - 128 bits Static Example:

20:00:00:00:C9:3D:A6:5C.x.x.x.x.x.x.x.x.• VNX SP port WWN - 128 bits

Static Example:

50:06:01:60:88:60:06:02:50:06:01:60:08:60:06:02

• Host access request forces a lookup to find a match If OK, host is allowed access If no match, host is denied access

Managing Host Access to Storage 7

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Access Control Lists: iSCSI

• LUN UID - 128 bits Globally unique will never be re-used Example:

60:06:01:60:08:F0:1E:00:BA:48:55:90:46:3D:DD:11

• Host IQN or EUI Persistent iSCSI provides two name formats for

different types of naming authorities: Examples:

iSCSI Qualified Name (IQN) Format: iqn.yyyy-mm.{reversed

domain name} Extended Unique Identifier (EUI)

Format: eui (e.g. eui.02004567A425678D)

• VNX port IQN or EUI - Static Example: iqn.1992-

04.com.emc:cx.fcntr00130702376.a4

Managing Host Access to Storage 8

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Managing Host Access to Storage

During this lesson the following topics were covered:• Access Logix definition• Access Logix functionality and limits

Lesson 1: Summary

9Managing Host Access to Storage

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Managing Host Access to Storage

This lesson covers the following topics:• Initiator and connectivity entries• Managing storage groups

Lesson 2: Managing Host Access

10Managing Host Access to Storage

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Unisphere Host Initiators

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View Initiator Information

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Connect Host

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Edit a Host Initiator

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Storage Groups

• LUNs presented only to hosts in the group

• Hosts only see LUNs in the group

Restrict LUN access to specific hosts

• Maximum number of LUNs in a storage group is model dependent

Single or Multiple

LUNs

• Model Dependent• Host may be in 1 storage group per

storage system• Maximum of 4 storage systems per host

Multiple Storage Groups

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Creating a Storage Group

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Adding LUNs to a Storage Group

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Adding Hosts to a Storage Group

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Deleting a Storage Group

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Managing Host Access to Storage

During this lesson the following topics were covered:• Initiator and connectivity entries• Managing storage groups

Lesson 2: Summary

20Managing Host Access to Storage

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Summary

Key points covered in this module:• Access Logix allows hosts to access data on the array • A storage group is a collection of one or more LUNs or metaLUNs

to which you connect one or more hosts.• Hosts can access only the LUNs in the storage group to which it is

connected

21Managing Host Access to Storage