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Asset ID: 1-72-1380245.1
Update Date:2012-09-21
Keywords:
Solution Type  Problem Resolution Sure

Solution  1380245.1 :   RDS Communications Stalled When Memory Depletes could lead to Hang, Node Eviction or Node reboot  

Related Items 
    

  • Oracle Exadata Storage Server Software
    •  
  • Exadata Database Machine V2
    •  
Related Categories 
    

  • PLA-Support>Database Technology>Engineered Systems>Oracle Exadata>DB: Exadata_EST
    •  




When there is memory depletion the RDS connections would fail and keep retrying until the IB driver successfully allocates memory. 
This could lead to:
- hang of system 
- eviction and/or reboot of a Database Node

Created from <SR 3-4502323081>

Applies to:

Exadata Database Machine V2 - Version All Versions and later
Oracle Exadata Storage Server Software - Version 11.2.1.2.0 to 11.2.2.3.5 [Release 11.2]
Information in this document applies to any platform.

Symptoms

Different types of hang may be observed in Exadata Database or Cell nodes. And the Exadata version is below 11.2.2.4.0.  And OS Watcher  explains memory depletion.

Changes

Exadata database and cell server running with low free memory.

Cause

low memory causes IB driver to fail allocating memory and RDS keeps retrying for connection. This leads to the hang.

Solution

This issue is due to unpublished Bug 10154755 and it is fixed in OFA 1.5.1.4.0.53.

The OFA fix is installed in database nodes through the minimal pack provided along with Cell images.

You need to upgrade the cell to 11.2.2.4.0 that has 1.5.1.4.0.53 OFA version.
And then apply the minimal pack on compute nodes.  This will have above OFA fix.

References

@ <BUG:10154755> - RDS CONNECTIONS SEVERED WHEN MEMORY DEPLETED
<BUG:12983481> - EXADATA: NODE HANG: DISKMON EXCEPTION IN [PTHREAD_MUTEX_LOCK()]
<NOTE:1284070.1> - Updating key software components on database hosts to match those on the cells
<NOTE:888828.1> - Database Machine and Exadata Storage Server 11g Release 2 (11.2) Supported Versions
<BUG:11714105> - EXADATA COMPUTE NODE GOT EVICTED / REBOOTED AFTER A RDS/IB PROBLEM

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