RMAN Backups To NFS Slower After Applying Minimal Pack For Database Hosts

Asset ID:	1-72-1398799.1
Update Date:	2016-03-09
Keywords:

Solution Type Problem Resolution Sure

Solution 1398799.1 : RMAN Backups To NFS Slower After Applying Minimal Pack For Database Hosts

Applies to:

Exadata Database Machine X2-2 Full Rack - Version All Versions and later
Oracle Exadata Storage Server Software - Version 11.2.1.2.0 and later
Oracle Database - Enterprise Edition - Version 11.2.0.2 and later
Information in this document applies to any platform.
***Checked for relevance on 04-Aug-2014***

Symptoms

- Applicable to customers who backup via RMAN to an NFS mount.
- After applying a Minimal Pack for Database Hosts patch to Exadata notice that the RMAN backup rate to NFS is much slower.

Changes

- Noticed after applying a Minimal Pack for Database Hosts to Exadata.

Cause

- During the Minimal Pack for Database Hosts patch apply you are required to dismount any NFS filesystems ( as described in the patch README) but, after the patching is successfully completed check the NFS filesystem was mounted again with the correct NFS options for RMAN.

- Not mounting with the correct NFS options can cause the RMAN backup to NFS performance problem.

Solution

- Remount the filesystem with the correct NFS mount options.

- The recommended options for 11.2.0.2 RMAN backups to NFS are :

# mount -o rsize=65536,wsize=65536,hard,actimeo=0,intr,nodev,nosuid -t nfs nodename:/filesystem

References

<NOTE:1053332.1> - Disable NUMA on database servers to improve performance of Linux file system utilities
<NOTE:1117597.1> - NFS options for 11.2.0.2 RMAN disk backups on Linux 64-bit

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