Data Mover Failover

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Data Mover Failover

Upon completion of this module, you should be able to:• Data Mover Failover• Test Data Mover Failover and Failback

Data Mover Failover 1


Data Mover Failover

Lesson 1: Data Mover Failover


During this lesson the following topics are covered:• The failover process and policies• Standby Data Movers• Planning and Configuring Data Mover failover


Failover Process• Primary Data Mover (DM) fails• Designated Standby Data Mover is activated as a spare

Requires identical network configuration


Standby Data Mover Primary Data Mover


Data Mover failure detection• Failover occurs under any of these conditions

Data Mover panic: A hardware or software faults Data Mover hang: A condition that leads to both internal down Failover failure: Failure during a failover operation. Spontaneous Data Mover reset

• Failover does not occur under these conditions Manually restarting a Data Mover Removing a Data Mover its slot Network Failure



How Data Mover Failover Works• Normal operations

Control Station constantly monitors all Data Movers (DM)

• When Primary DM fails Control Station instructs

Standby to take over Standby resumes entire identity

and all production services Original Primary goes into failed

state• After problem is resolved

Administrator manually initiates restoration of original Primary


FAILED Primary Data Mover

Control Station

“Go!”

Primary Data Mover Standby Data Mover

Control Station

Monitor

Primary Data Mover Standby Data Mover

Control Station

MonitorRestore


Standby Data Mover• Hot-spare for Primary Data Movers• Can act as a spare for up to 7 primaries (depending on model)

Recommended ratio is at least one Standby for three primaries

• For the highest availability, use 1:1 ratio• On a two Data Mover VNX, server_3 is pre-configured as a

Standby for server_2• VNX OE software is the same for all hardware platforms



Failover Policies• Pre-determined action• Invoked by the Control Station when it detects a failover

condition• Policy types

Auto Retry Manual



Planning for Data Mover Failover• Determine Primary and Standby Data Movers

Ensure Primaries and Standbys have the same network hardware components

Standbys are free of any configurations• Switch ports of the Standby Data Movers are assigned to the

same VLANs as the Primary• Ethernet Jumbo frame configuration related to Primary Data

Mover ports are in place for the Standby Data Mover• Network configuration must be identical

Speed/Duplex LACP / Link aggregation Fail Safe Networking (FSN)



Failover Configuration


• To configure server_3 as the Standby for server_2:

1. Select System > Hardware > Data Movers

2. Select the Data Mover, and click Properties.

3. Set Standby Movers to server_3

4. Failover Policy, auto5. Click Apply

Server role

Failover policy

Standby DM


Data Mover Failover

During this lesson the following topics were covered:• The failover process and policies• Standby Data Movers• Planning and Configuring Data Mover failover

Lesson 1: Summary



Data Mover Failover

During this lesson the following topics are covered:• Testing Data Mover failover• Restoring a Data Mover• Deleting a Data Mover failover relationship

Lesson 2: Testing Data Mover Failover and Failback



Data Mover Failover Testing Considerations• Test Data Mover failover periodically/regularly (e.g. Quarterly)• Perform test at low/no impact times• When testing, validate the following

Standby assumes the identity of Primary VLAN membership and LACP configuration User access to:

File systems Shares Home directories



Testing Data Mover Failover• Run the following CLI Command to manually activate the Standby Data

Mover server_standby <primary_DM> –activate mover



Restoring a Data Mover After FailoverSystem > Hardware > Data Movers• Select Data Mover to restore and click Restore



Deleting a Failover Relationship• To delete Standby relationship:

Hardware → Data Movers > Server_x → uncheck field Standby Movers


• To change Data Mover from Standby to Primary: Hardware → Data Movers → server_x → select Role: Primary


Data Mover Failover

During this lesson the following topics were covered:• Testing Data Mover failover• Restoring a Data Mover• Deleting a Data Mover failover relationship

Lesson 2: Summary



SummaryKey points covered in this module:• Successful Data Mover failover requires careful planning of

network switch and port configurations• Test plans should include validating access to VNX resources:

File systems Shares Home directories



Course SummaryKey points covered in this course:• Configuration of Unisphere Security and Features• Configuration and management of VNX block access for open

systems hosts (Linux, Windows and VMware ESXi) • Configuration and management of VNX file access for Windows

and Linux user/application environments via NFS and CIFS environments• Configuration of VNX local replication in block and file

environments

18Data Mover Failover


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Data Mover Failover

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