R_MOD_21-Data_Mover_Failover

Report
Data Mover Failover
Upon completion of this module, you should be able to:
• Data Mover Failover
• Test Data Mover Failover and Failback
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Data Mover Failover
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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
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Data Mover Failover
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Failover Process
• Primary Data Mover (DM) fails
• Designated Standby Data Mover is activated as a spare
 Requires identical network configuration
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Data Mover Failover
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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
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How Data Mover Failover Works
• Normal operations
Primary Data Mover
 Control Station constantly
Standby Data Mover
Monitor
monitors all Data Movers (DM)
• When Primary DM fails
Control Station
 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
“Go!”
Control Station
Primary Data Mover
Restore
Standby Data Mover
Monitor
Control Station
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Data Mover Failover
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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
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Data Mover Failover
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Failover Policies
• Pre-determined action
• Invoked by the Control Station when it detects a failover
•
condition
Policy types
 Auto
 Retry
 Manual
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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)
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Data Mover Failover
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Failover Configuration
• To configure server_3 as
Server role
the Standby for server_2:
1. Select System > Hardware
2.
3.
4.
5.
> Data Movers
Select the Data Mover, and
click Properties.
Set Standby Movers to
server_3
Failover Policy, auto
Click Apply
Copyright © 2014 EMC Corporation. All Rights Reserved.
Standby
DM
Failover
policy
Data Mover Failover
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Data Mover Failover
Lesson 1: Summary
During this lesson the following topics were covered:
• The failover process and policies
• Standby Data Movers
• Planning and Configuring Data Mover failover
Copyright © 2014 EMC Corporation. All Rights Reserved.
Data Mover Failover
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Data Mover Failover
Lesson 2: Testing Data Mover Failover and Failback
During this lesson the following topics are covered:
• Testing Data Mover failover
• Restoring a Data Mover
• Deleting a Data Mover failover relationship
Copyright © 2014 EMC Corporation. All Rights Reserved.
Data Mover Failover
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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
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Data Mover Failover
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Testing Data Mover Failover
• Run the following CLI Command to manually activate the Standby Data
Mover
server_standby <primary_DM> –activate mover
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Data Mover Failover
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Restoring a Data Mover After Failover
System > Hardware > Data Movers
• Select Data Mover to restore and click Restore
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Data Mover Failover
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Deleting a Failover Relationship
• To delete Standby relationship:
Hardware → Data Movers > Server_x
→ uncheck field Standby Movers
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• To change Data Mover from Standby
to Primary: Hardware → Data
Movers → server_x → select Role:
Primary
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Data Mover Failover
Lesson 2: Summary
During this lesson the following topics were covered:
• Testing Data Mover failover
• Restoring a Data Mover
• Deleting a Data Mover failover relationship
Copyright © 2014 EMC Corporation. All Rights Reserved.
Data Mover Failover
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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
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Data Mover Failover
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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
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Data Mover Failover
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Thank You!
Copyright © 2014 EMC Corporation. All Rights Reserved.

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