balance I/O

Vincent M · *nix forums Guru Joined: 22 Feb 2005 Posts: 1332

hi,

I try to balance I/O I use sar -d ( AIX 5.1 , oracle 9.2.0.4 )
Is it a good idea to decrease the disks which are near 100% busy ?
( 90% busy is it a low throuput disk ? )
Is it the right direction to look at %busy ?

Thanks in advance ...

Mark Taylor · *nix forums Guru Wannabe Joined: 21 Feb 2005 Posts: 292

Use filemon to identify the LVs or files on those disks that are a
problem. Spread those LVs / filesystems that that file resides on over
as many spindles and controllers as you can to get some parallelism
going and stripe the LVs if possible (may require you to migrate to
striped LV which will be a backup / restore action).

Make sure you have enough aioservers (smitty aio) defined (or posix_aio
if you app uses them, fyi Oracle does not use posix_aio)

If you do not have enough internal disks, then you will want to look at
FC attached storage.

HTH
Mark Taylor

florian.heigl@gmail.com · *nix forums beginner Joined: 17 Jul 2005 Posts: 24

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