Bug 4283 - Update to Chapter 42 of the Samba HOWTO Collection for AIX
Summary: Update to Chapter 42 of the Samba HOWTO Collection for AIX
Alias: None
Product: Samba 3.0
Classification: Unclassified
Component: Docs (show other bugs)
Version: 3.0.23d
Hardware: PPC AIX
: P3 normal
Target Milestone: none
Assignee: Samba Bugzilla Account
QA Contact: Samba Documentation QA Contact~
Depends on:
Reported: 2006-12-06 20:09 UTC by William Jojo
Modified: 2007-09-12 00:07 UTC (History)
0 users

See Also:


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Description William Jojo 2006-12-06 20:09:43 UTC
Disabling sequential read ahead can improve Samba performance significantly when there is a relatively high level of multiprogramming (many smbd processes or mixed with another workload), not an abundance of physical memory or slower disk technology. These can cause AIX to have a higher WAIT values. Disabling sequential read-ahead can also have an adverse affect on other workloads in the system so you will need to evaluate other applications for impact.

It is recommended to use the defaults provided by IBM, but if you experience a high amount of wait time, try disabling read-ahead with the following commands:

For AIX 5.1 and earlier: "vmtune -r 0"

For AIX 5.2 and later jfs filesystems: "ioo -o minpgahead=0"

For AIX 5.2 and later jfs2 filesystems: "ioo -o j2_minPageReadAhead=0"

If you have a mix of jfs and jfs2 filesystems on the same host, simply use both ioo commands.
Comment 1 John H Terpstra (mail address dead( 2007-09-12 00:07:24 UTC
Thanks for this. Applied and will first appear with 3.2.0 series releases.