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Old 06-07-2009, 09:02 AM   #1
SpLaSh212
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Disk Performance & RHEL


Hey guys,
I have a server with 64 GB RAM, 4 Quad-Core AMD Opteron (16 Cores) 2200 MHz Running Red Hat 5.1.
The server is idle, and connected to EMC DMX 3 machine (2 hba's, with powerpath).

When I run cp command from that disk I see that iostat reports 10 MB\s pace, and It takes 2 min to copy 1 GB file.
The disk Can't be the bottleneck because of the reason, when I run 10 cp's (of different files of course) it takes 2 min for ALL the files to copy (iostat reports 100 MB\s read pace).

How can I make the 1 specified process to copy as fast as possible !?
ionice not working because no other processes try to get IO.
I tried to change the IO Scheduler, but it didn't helped :\

Any ideas ??

thnx !
 
Old 06-07-2009, 05:32 PM   #2
syg00
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Did you try NOOP ?.
 
Old 06-08-2009, 01:11 AM   #3
SpLaSh212
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Can you explain what you mean ?
 
Old 06-08-2009, 01:32 AM   #4
syg00
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Quote:
Originally Posted by SpLaSh212 View Post
I tried to change the IO Scheduler, but it didn't helped
Which I/O scheduler(s) ?. NOOP is certainly worth a try if there is an outboard controller involved.
 
Old 06-08-2009, 02:15 AM   #5
antonyphilip
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what a NOOP meant and how it works? vcan any body expalin please?
 
Old 06-08-2009, 03:24 AM   #6
SpLaSh212
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I tried all the schedulers, noop/cfq/ and all the others ...

The LV size is 2.5 TB with ext3.
 
  


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