AIX on Power System: Low-speed Write On An ACFS Volume (Doc ID 1901785.1)

Last updated on NOVEMBER 14, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 to 12.1.0.1 [Release 11.2 to 12.1]
IBM AIX on POWER Systems (64-bit)

Symptoms

 You are using Oracle RAC 11gR2 on AIX 7.1 and have a diskgroup ACFS, ACFS volume enabled and an ACFS mounted filesystem for rman external tables files (large files).

The ACFS volume works correctly but is having a poor write speed.

Also, Legato is being used as the backup tool.

Changes

 Ensure that Virtual memory (VMM) is tuned per the IBM recommendations.

Cause

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