Inquiry failing for some IBM storage arrays after they've been rebooted

Solution In Progress - Updated -

Issue

For some IBM storage arrays or virtual arrays like the SVC we see inquiries failing shortly after the arrays have been rebooted.

As a possible side effect we can witness on systems with eh_deadline enabled that the SCSI enters the escalation ladder up to the HBA reset and therefore interrupts connections to other ports / LUNs as a consequence of failed / timed-out commands to the IBM array.

Environment

  • Red Hat Enterprise Linux (any version) connected to
  • IBM storage arrays (it's not clear yet, which arrays show the behavior and which don't).
    • So far we know that the problem happens with IBM v7000 storage and the SVC.

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