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Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Copyright © 2014 EMC Corporation. All Rights Reserved.
Data Mover Failover
Lesson 1: Data Mover Failover
Data Mover Failover 2
During this lesson the following topics are covered:• The failover process and policies• Standby Data Movers• Planning and Configuring Data Mover failover
Copyright © 2014 EMC Corporation. All Rights Reserved.
Failover Process
• Primary Data Mover (DM) fails• Designated Standby Data Mover is activated as a spare
Requires identical network configuration
Data Mover Failover 3
Standby Data Mover Primary Data Mover
Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Data Mover Failover 4
Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Data Mover Failover 5
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
Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Data Mover Failover 6
Copyright © 2014 EMC Corporation. All Rights Reserved.
Failover Policies
• Pre-determined action• Invoked by the Control Station when it detects a failover
condition• Policy types
Auto Retry Manual
Data Mover Failover 7
Copyright © 2014 EMC Corporation. All Rights Reserved.
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)
Data Mover Failover 8
Copyright © 2014 EMC Corporation. All Rights Reserved.
Failover Configuration
Data Mover Failover 9
• 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
Copyright © 2014 EMC Corporation. All Rights Reserved.
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 10
Copyright © 2014 EMC Corporation. All Rights Reserved.
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 11
Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Data Mover Failover 12
Copyright © 2014 EMC Corporation. All Rights Reserved.
Testing Data Mover Failover
• Run the following CLI Command to manually activate the Standby Data Mover
server_standby <primary_DM> –activate mover
Data Mover Failover 13
Copyright © 2014 EMC Corporation. All Rights Reserved.
Restoring a Data Mover After Failover
System > Hardware > Data Movers• Select Data Mover to restore and click Restore
Data Mover Failover 14
Copyright © 2014 EMC Corporation. All Rights Reserved.
Deleting a Failover Relationship
• To delete Standby relationship: Hardware → Data Movers > Server_x → uncheck field Standby Movers
Data Mover Failover 15
• To change Data Mover from Standby to Primary: Hardware → Data Movers → server_x → select Role: Primary
Copyright © 2014 EMC Corporation. All Rights Reserved.
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
Data Mover Failover 16
Copyright © 2014 EMC Corporation. All Rights Reserved.
Summary
Key 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
Data Mover Failover 17
Copyright © 2014 EMC Corporation. All Rights Reserved.
Course Summary
Key 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