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What E-Series events indicate a change in volume ownership by implicit transfer?

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Applies to

  • E-Series
  • SANtricity OS
  • Automatic load balancing (ALB)

Answer

Changing volume ownership by implicit transfer involves the following events:
 
Event When happens? Move Preferred Owner? Move Current Owner?
Auto Load Balancing implicit volume transfer Once per hour based on historical workload Yes Yes
IO shipping implicit volume transfer 75% of the IO is sent to the the non-owning controller No Yes
Fail-back implicit volume transfer SAN connectivity is restored No Yes

Notes:

  • Implicit volume transfer is performed by controller
  • Controller cache not enabled or was internally disabled and Write-back caching fully restored are detected while change in volume ownership
  • A mismatch between Preferred Owner and Current Owner raises Volume not on preferred path due to AVT/RDAC failover event

Additional Information

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