Hi
 
We have a site backing up 20-25TB of data every night spread across 3 different 
instances running in 2 clusters. We use AIXASYNCIO on all of these server and 
it's certainly an I/O increase. If you're gonna use it, make sure you increase 
the number of AIO servers. You will notice abit more memory being used due to 
the use of ASYNC I/O, but it's well worth the memory.
 
If you're using SAN volumes, other things to look at is increasing the 
queue_depth of your hdisks (default is usually to low). If you're using RAW 
devices for storagepools, you should also look at lowering the filesystem 
cache, since there's no really point in caching the database volumes, and RAW 
devices arent handled by the filesystem cache.
 
Best Regards
 
Daniel Sparrman





Daniel Sparrman
Exist i Stockholm AB
Växel: 08-754 98 00
Fax: 08-754 97 30
daniel.sparrman AT exist DOT se
http://www.existgruppen.se
Posthusgatan 1 761 30 NORRTÄLJE



-----"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> skrev: -----


Till: ADSM-L AT VM.MARIST DOT EDU
Från: "Pagnotta, Pam (CONTR)" <Pam.Pagnotta AT HQ.DOE DOT GOV>
Sänt av: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
Datum: 09/27/2011 01:27
Ärende: [ADSM-L] AIXASYNCIO

Hello,

Anyone with experience with using the AIXASYNCIO server parameter on a version 
6.2** TSM server running on an AIX v6.1 OS? We backup approximately 5TB of data 
nightly and although the performance is not bad, if this would make it better, 
we might have more time for administrative work.

Just looking for some opinions from all the wonderful experience out there.

Thank you,
Pam




Pam Pagnotta
Sr. Systems Engineer
Energy Enterprise Solutions (EES), LLC
Supporting IM-621.1, Enterprise Service Center East
Contractor to the U.S. Department of Energy
Office: 301-903-5508
Email: pam.pagnotta AT hq.doe DOT gov
Location: USA (EST/EDT)