From: Yard, John (jyard@AIS.UCLA.EDU)
Date: Thu May 13 2004 - 13:01:38 EDT
Software support recommended against load balancing,
saying it would cause 'thrashing' of LUNs from one controller to
another.
We are upgrading to 5.1 - not 5.2 for app reasons - in the near future.
Will there be some resolution on 5.1 ?
Currently we are getting much better performance out of 10K rpm
2104s than on the 15K rpm fastt600, even though the fastt600
was significantly more expensive,
Jyard
UCLA
________________________________
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
jeff barratt-mccartney
Sent: Wednesday, May 12, 2004 5:08 PM
To: aix-l@Princeton.EDU
Subject: Re: Fastt600 Performance
did you try chdev -l dar0 -a loadbalancing=yes
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On
Behalf Of Yard, John
Sent: Wednesday, May 12, 2004 4:30 PM
To: aix-l@Princeton.EDU
Subject: Fastt600 Performance
________________________________
I have a new fastt600 direct attached to 2 h80's
( aix 4.3.3.). The fast Best Practices Guide
talks about balancing LUNs across controllers,
but when I did this with a raid device, creating
a logical volume across 2 raid devices, tests
showed the system reading not from both raid devices
at the same time, but in round robin fashion.
Thruput was not terrible, but was not exceptional
either.
Anyone have any experience or suggestions
tuning the fastt600, or other fast devices ?
Thanks,
John Yard
UCLA
John Yard
UCLA Administrative Information Systems
Distributed Platforms
Unix/Win2000 Admin/Sybase/Oracle/SqlSrvr/Networking
310-825-1725
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