ODA High load and VM hangs

Asset ID:	1-72-2254563.1
Update Date:	2017-05-10
Keywords:

Solution Type Problem Resolution Sure

Solution 2254563.1 : ODA High load and VM hangs

Applies to:

Oracle Database Appliance X5-2 - Version All Versions and later
Information in this document applies to any platform.

Symptoms

The oda_base experiencing high cpu load and may also see high disk utilization.
This caused the hanging of all VMs.

The messages log and database process stacks may show stack dumps with Ks* related functions.

Very large sparse files on ACFS are being used.

In ofs.log related to acfs we can see also see Ks related functions listed:

KsRecv: recv failed -104

Cause

Unpublished Bug 20463674 : OFSADDALLOCATIONTOMCB ASSERTION FAILURE: _STATUS != KS_TIMEOUT

Fixes a scalable algorithm for file access on ACFS

If the customer has a heavily fragmented file located on ACFS and it takes a long time to access it the first time.
The fragmentation may well be due to the file being sparse and very large.

Solution

The bug is fixed in 12.2.

No workaround is available.

Check MOS for availability of a patch 20463674.

References

<BUG:20463674> - OFSADDALLOCATIONTOMCB ASSERTION FAILURE: _STATUS UNEQUALS KS_TIMEOUT
<BUG:23581783> - ODA ENVIRONMENT SLOW DUE TO ACFS AND NFS ISSUES

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