Alert --- ODA: ODA System may hang or run extremely slow suddenly. (Doc ID 2189437.1)

Last updated on AUGUST 08, 2017

Applies to:

Oracle Database Appliance Software - Version 2.7.0.0 and later
Information in this document applies to any platform.
We have seen ODA HW type: V1 X3-2 X4-2 X5-2 and all versions from 2.7 till 12.1.2.8 both can hit this issue.

Symptoms

 It can have different final symptom like:
1. The whole system hang.
2. The RDBMS on the system hang.
3. All VM hang.
4. Everything is very slow.
5. ASM Disk got offline first then may dropped.

6. Sometime the issue can go away after couple hours or days.  And come back after awhile.

But all of these case has one symptom:

One of more of the disks is using 100% util but the write/read IO on the disk is very small for example:

zzz ***Fri Jul 3 07:35:13 BST 2015
sdq 0.00 0.00 0.00 0.00 0.00 0.00 0.00  24.00 0.00 0.00 100.00

Here the 100% is the disk util and there is no io on the system.  It keeps like this for more than 5 minutes mostly they hit the issue. 

Cause

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