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Slower ACFS I/O Performance After Applying PSU 11.2.0.4.8 and General Slow ACFS Performance on AIX for 11.2 (Doc ID 2233606.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.1.0.1 [Release 11.2 to 12.1]
IBM AIX on POWER Systems (64-bit)
IBM AIX on POWER Systems (32-bit)

Symptoms

Performance of tape backups from ACFS was much slower after applying 11.2.0.4.8 GI PSU. RMAN backup's seem to be running okay.

Comparing ACFS to a regular filesystem, it took twice the time on ACFS to dd a file to /dev/null.

You may also see heavy paging on the system. 

oks log will show lot of page steals and read faults.

Collect in-memory logs: "acfsutil log -f okslog.txt", compress okslog.txt

 

Changes

 Applied 11.2.0.4.8 GI PSU.

Cause

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