Re: AIX V5.3 & FASTT500 PERFORMANCE TUNING
- From: John Monahan <JMonahan@xxxxxxxxxxxx>
- Date: Tue, 10 Jan 2006 16:30:23 -0600
Do you have one card attached to each controller (A and B) on the FastT or both cards are attached to A? Is this the only host attached to the FastT?
It would help if you could spread your load over both controllers with one hdisk on each. Also run the performance monitor tool on the FastT and tell us how many I/O per sec etc. controller A is doing.
One thing to check is the cache block size on the FastT - It can be set to either 4K or 16K. You can change this on the fly. Depending upon your average I/O size, etc. it may make a difference.
Here are my notes from an FC environment:
chdev -l fcs0 -a lg_term_dma=0x1000000 -a num_cmd_elems=1024 -P (repeat for each HBA)
chdev -l hdisk4 -a queue_depth=64 -P (repeat for all FastT hdisks, see queue depth below)
Max combined queue depth for all hosts attached to one FastT should be no more than 512
Use the formula 512 / (#ofhostsattached * LUNsperhost)
______________________________
John Monahan
Senior Consultant Enterprise Solutions
Computech Resources, Inc.
Office: 952-833-0930 ext 109
Cell: 952-221-6938
http://www.computechresources.com
| JOSEPH KREMBLAS <JKREMBLAS@xxxxxxxxxxxxxxxxx>
Sent by: IBM AIX Discussion List <aix-l@xxxxxxxxxxxxx> 01/10/2006 02:56 PM
|
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Hi fellow AIX friends & associates:
I have a problem that I need your help with concerning a FAStT500 (3552-1RU)
directly connected (not connected through a switch) to an 8-way RS/6000
Model M80 with 16384MB of ram running AIX V5.3 ML03 (with post-ML03 fixes).
The M80 described above is being used for DB2 OLAP V8.2 testing. The
firmware on both the M80 and the FAStT500 is up-to-date. There are two (2)
EMULEX LP9002L cards installed in the M80 with data fibre channel cables
connected from each LP9002L to the FAStT500 storage controller.
There is a 1TB RAID-5 LUN presented to AIX, and cfgmgr shows the LUN as
hdisk5. There is only one active controller (being controller A) that
fget_config -A is reporting for dac0.
We are using Storage Manager V9.12 to manage and configure the DASD on the
FAStT500.
We are hoping to see better write performance on FAStT500 when our OLAP job
runs; the problem for me is: Where do I begin with respect to tuning on AIX
as well as the FAStT500? I have done AIX tuning in the past using AIX V4.x
on internal and external SSA, but I am at a loss as to fibre channel, as
well as the FAStT500.
As for the current write performance when our OLAP jobs runs: I can see a
maximum of 20MB/s with an average of 9MB/s. However, when I run a "tar -cvf
. . . " on a filesystem that resides on the FAStT500 I've seen as high as
78MB/s and an avg. of 42MB/s sustained.
Where do I start? Any pointers? I've read as much as I can presently
absord concerning the FAStT500 as well as the new AIX performance tuning
commands.
I will be most happy to supply more detailed information upon request.
--
Best Regards, I Am,
Joseph Kremblas
Phone: (919) 484-3071
IBM Certified Advanced Technical Expert (CATE) - RS/6000 (pSeries) AIX
IBM Certified Specialist - RS/6000 SP AND PSSP 3.1
IBM Certified Specialist - pSeries AIX V5.1 Systems Support
IBM Certified Specialist - pSeries AIX V5.1 System Administration
IBM Certificate of Proficiency - AIX Communications
IBM Certificate of Proficiency - AIX Installation, Backup and System
Recovery
IBM Certificate of Proficiency - AIX Problem Determination
IBM Certificate of Proficiency - AIX Performance and Systems Tuning
IBM Certified Specialist - AIX V4.X Systems Support
IBM Certified Solutions Expert - MQSeries
IBM Certified Specialist - MQSeries
"Doubt is a pain too lonely to know that faith is his twin brother."
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