Originally posted by: SystemAdmin

Hello everyone.
I wanted to see the I/O statistics of a particular HardDisk(Logical I/O disk) connected to SAN. what comand should i use to see the details. I am using AIX default PCM.
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Originally posted by: SystemAdmin

#iostat | grep hdiskx
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Originally posted by: SystemAdmin

Thanks for ur reply. I tried executing the command
#iostat | grep hdiskx
It gave me am empty output.What coulde be the possible reason?

• Elwinn

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Originally posted by: tony.evans

I think the suggestion was to use hdiskx where x is the number of the disk you're interested in, like hdisk1 or hdisk2.
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Originally posted by: SystemAdmin

Yes i replaced the X with my HardDisk in my case "hdisk3". Still i got the same response. What could be the problem? I am using default AIX-PCM and Hitachi-Open-v subsytem.
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Originally posted by: tony.evans

what do you get from iostat on it's own, can you paste the output.
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Originally posted by: SystemAdmin

This is the output of command execution

bash-2.05b# iostat | grep hdisk2
bash-2.05b#

bash-2.05b# iostat

System configuration: lcpu=1 drives=8 paths=6 vdisks=0

tty: tin tout avg-cpu: % user % sys % idle % iowait
0.2 1.8 0.3 0.4 99.3 0.0
" Disk history since boot not available. "
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Originally posted by: shargus

You may need to turn on iostat disk i/o history.

chdev -l sys0 -a iostat=true

Don't know off the top of my head if this requires a reboot...
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Originally posted by: SystemAdmin

Thnks shargus for your reply. I will try it out.
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Originally posted by: SystemAdmin

I tried executing iostat command,after issuing the chdev command. It do not need a restart. Thank you.

--Elwinn
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Originally posted by: SystemAdmin

Is there a way to find out the iostat information of each path that is connected to HardDisk(I/O disk)?
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Originally posted by: jvk

iostat -m 3

# man iostat
...
-m
Specifies the statistics for paths

man pages:
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.cmds/doc/aixcmds3/iostat.htm
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Originally posted by: SystemAdmin

Thanks jkv. I will try executing the command.
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