Unfortunately very misleading answer. I am also neither "down" nor "up" it
but have done it.
Do not mess disk settings with AIX Asynchronous I/O kernel extension.
Oracle CANNOT work without AIX aio0 "Available" (look in *any* Oracle
server Installation Guide).
Second - it is AIXDIRECTIO not SOLARISDIRECTIO, isn't it.
Both options have relevance to all types of volumes managed by TSM's LVM -
DB, Log and diskpool (do not mess it with AIX LVM).

Andy,

I've installed v5.1.x servers with both options enabled but have not
compared specifically improvement percentage. Some performance increase
was visible. Was the increase due to these settings or just because code
improvement since v4.2.x unfortunately I cannot state. What is obvious was
memory consuption for AIX file caching which ought to come from Direct I/O
option.

Zlatko Krastev
IT Consultant






"PINNI, BALANAND (SBCSI)" <bp3965 AT SBC DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
23.04.2003 18:40
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Re: AIX and async I/O


Andy,

I have not down this tweaking. But I did do it in Oracle asyncio is set to
false for SSA disks, since there were performance issues.

When we used SSA disks for oracle we had very bad performance for commits.
It took very long time to commit data in tables. But when we disabled it
was
over in few minutes.

Second AIXDIRECTIO .....What I am guessing is that in SUN UNIX we have
this
parameter setting for /etc/vfstab mount options. Where instead of going
through disk buffers the disk data is directly written on to disk for
block
special devices. This was already verified by someone on the list already.

Hope the same applies to TSM TOO!!!

I am just talking about only that I know about these parameters in their
respective fields.
I am very eager to know if someone has done in TSM too!!!

I think one has relevance to DB volumes and the other with disk!!!!

Balanand Pinni

-----Original Message-----
From: Wilcox, Andy [mailto:andy.wilcox AT AQUILA-NETWORKS.CO DOT UK]
Sent: Wednesday, April 23, 2003 10:07 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: AIX and async I/O

Hiya,

I have just been browsing through the latest admin guide for TSM, and have
noticed new performance tuning tweaks on AIX. The two in quesiton are
AIXASYNCIO and AIXDIRECTIO. Has anyone taken a look at enabling
either/both
of these options and found any worthwhile improvements at all?

Cheers

Andy Wilcox
Midrange Services
Aquila Networks Services Ltd



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