Oracle ZFS Storage Appliance: Exalogic VMs and Compute Nodes are Hung

Asset ID:	1-72-2320281.1
Update Date:	2017-12-05
Keywords:

Solution Type Problem Resolution Sure

Solution 2320281.1 : Oracle ZFS Storage Appliance: Exalogic VMs and Compute Nodes are Hung

Applies to:

Exalogic Elastic Cloud X5-2 Quarter Rack - Version X5 and later
7000 Appliance OS (Fishworks)

Symptoms

It is reported that there is the inability to connect to running VMs and the compute nodes appear to be hung.

The ZFS_SA storage is suspect in causing this issue.

Cause

There is a current known bug with the ZFS_SA array code that can be the cause of this issue.

Bug 26237803 Certain threads get stuck because they are transient and are not being being taken by idle cpus.

Solution

NOTE: Appliance code 8.7.12 and above has the fix for this issue.

If this issue is suspected, then a case should be opened with Oracle Technical Support for evaluation.

Work around provided in the bug:

Add the following to /etc/system and reboot node:

*
* Adjustment due to Bug 26237803 at 2017-09-16
*

set thread_transience_kernel=0
set thread_transience_user=0

References

<BUG:26237803> - BACKPORT 17697871 TO AK-2013-MICRO - SUNBT7199390 RUNNABLE THREAD OCCASIONALLY S
<NOTE:2018621.1> - How To Resolve Unrecoverable USB Hardware Error Reported On Internal USB For ZFS Storage Appliance
<BUG:17697871> - SUNBT7199390 RUNNABLE THREAD OCCASIONALLY STAYS IN RUN QUEUE FOR TOO LONG
<BUG:21859548> - FIX REGRESSION CAUSED BY BUG 17697871

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