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February 11th, 2009 19:00
DMX-Performance Issue
We have 2 serevrs of same host configuration and apps running.
One of the server is reporting slow performance. The back end disk configuration and RAID levels applied for both servers are the same.
The only difference in Configuration is that the Slower server is seeing luns through a shared FA (17 more servers connected to the FA). And the faster server is accessing luns through a dedicated FA ( only server on the FA ). And we are using the D ports for this as we do not have SRDF in our environment.
Will the shared / Dedicated FA-D port make any difference in performance?
One of the server is reporting slow performance. The back end disk configuration and RAID levels applied for both servers are the same.
The only difference in Configuration is that the Slower server is seeing luns through a shared FA (17 more servers connected to the FA). And the faster server is accessing luns through a dedicated FA ( only server on the FA ). And we are using the D ports for this as we do not have SRDF in our environment.
Will the shared / Dedicated FA-D port make any difference in performance?
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xe2sdc
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2.8K Posts
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February 11th, 2009 22:00
Having that said, obviously a dedicated port can give 100% of its performances to the only attached host while a "shared" port will spread its performances among all connected servers... However a shared port may become a bottleneck if someone is really using the port. A shared port with 10s of idle hosts will give same performances of a dedicated port
You can try to figure out if ports/processors are idle or too busy using symstat command
Alastair2
16 Posts
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February 12th, 2009 07:00
If you don't have ECC, I would suggest you get it. If you do have it, I would suggest you use it.
With ECC's Performance Manager, it would take about 10 seconds to see if the FA port is your bottleneck. It really is a good tool!
SKT2
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February 12th, 2009 09:00
DFT2
6 Posts
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March 5th, 2009 06:00
It will probably be real-time, but it may help.
alokjain1
44 Posts
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April 28th, 2009 18:00
Have the sysadmins check the service time or response time metric at the host level on both the hosts. If they are similar then it is not a IO sub-system problem. If one is higher then the other, then we definitely need to start looking at the IO-subsystem. The difference between the FA connectivity is definitely starkly different and may be impacting performance.