Oracle ZFS Storage Appliance: reboot "Unexpectedly found SAS zone locks held" (Doc ID 2262465.1)

Last updated on MAY 04, 2017

Applies to:

Sun ZFS Storage 7320 - Version All Versions to All Versions [Release All Releases]
Sun ZFS Storage 7420 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-2 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-4 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS4-4 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

ZFS Array running code version ak8.5.0 unexpectedly rebooted, but did not panic.

Examining akd.ak.txt at the time of the reboot you find:

Wed May 3 23:36:36 2017: Unexpectedly found SAS zone locks held

In jobs.txt you find:

[ Wed May 3 23:36:37 2017 /usr/sbin/uadmin "/usr/sbin/uadmin" "1" "1" ]

The above is the command that rebooted the system because the SAS zone lock sense was lost. This prevents a split brain condition.

Also the following is seen in the sas.ak.txt file:

Wed May 3 23:36:36 2017
nvlist version: 0
smp_errno = 0x7
smp_errmsg = engine library not found
errno = 0x6
message = NOLOCK found active ZM 504d435349455241
expander = (embedded nvlist)
nvlist version: 0
device_path = /devices/pci@0,0/pci8086,3410@9/pci11f8,8001@0/iport@f0/smp@w508002000148deff:smp
address = 0x508002000148deff
vendor = ORACLE
product = DE2-24C
revision = 0018
component_vendor = PMCSIERA
component_id = 0x8005
component_revision = 0x2
(end expander)

It was thought that forcing a crash dump rather than a reboot would provide more information on the cause of the zone lock issue. But, anything that delays the reboot of this node runs the risk of inducing a split brain condition.

Cause

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