Quiescing and resuming an ESS storage system causes errors

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This condition occurs during normal operation.

Problem

When you perform a quiesce and resume action, you might receive a different response on an ESS 800 storage system than on a DS8000® storage system.

On a DS8000 storage system, you should not see a change in the session or storage system when you run a quiesce and resume action. When you run a quiesce and resume action on an ESS 800 storage system, the following might occur:
  • An IWNR2110E error is generated.
  • The storage system storage becomes disconnected.
  • The session goes into a severe state.
  • The role pairs become unknown during the resume.

If the heartbeat is enabled and one of the preceding errors occurs, it results in a freeze of I/O on the primary storage device for the duration of the logical subsystem (LSS) long busy timeout, and all pairs are suspended.

Action

If there are ESS 800 volumes in the session, disable the Metro Mirror heartbeat on the management server before you run the quiesce and resume on the storage system.