Solaris Storage Driver Known Issues of I/O Request Blocked for Disk Device (Doc ID 1384697.1)

Last updated on OCTOBER 05, 2022

Applies to:

Symptoms

Under the following circumstances, i/o request can be stuck in the disk device driver without any message being displayed at the console. This can be seen with user command doing i/o or trying to access logical unit (disk) being block and not killable using kill(1M) or pkill(1M) command.

• Following a failover operation or any change in the configuration that will trigger a check of the path state of multipathed logical unit, read or write operation can be blocked.
• System resource starvation

This problem affects only configuration matching some of these criteria:

• Solaris version
  • Solaris 10: MPxIO Multipathing module scsi_vhci version 1.73 or below
  • Solaris 11: release 11.0.3.4.0 or below
• Solaris Multipathing (MPxIO) enabled to support active/passive or ALUA Storage array
• Failover operation happened following reboot of Storage array controller or loss of fiber channel link

NOTE. This is a generic document which deals with all known case of i/o being stuck, so not only when MPxIO is enabled, see below several and independent examples.

Changes

 Most of the issues described in the document are seen after Failover operation triggered by reboot of Storage Array controller, loss of Fiber Channel link, etc ... or when the system is low on memory.

Cause

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