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Old 10-04-2008, 08:40 AM   #1
rbh123
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Registered: May 2005
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Problem with GFS read and write performance


Hi,

I am using iozone to obtain read and write performance of GFS. I have a single logical volume with the GFS filesystem and mounted it on one server. I have used lock_nolock locking protocol to ensure it is treated as local filesystem.
When i run multiple threads of iozone on the GFS partition, I observe that the performance(read and write) numbers decreases as the no.of iozone thread increases.
Is this expected behaviour ? If yes, then how do check for scalability because as we increase the iozone threads the performance numbers would be decrementing.

Thanks in Advance,
RBH
 
Old 10-06-2008, 04:24 AM   #2
druuna
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Hi,

Do all the connecting nodes have the same date/time? If not (a difference of mere minutes is enough) there are a lot of unnecessary i-node updates.

Not much to go on, but hope this helps.
 
  


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