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тАО03-10-2009 11:16 PM
тАО03-10-2009 11:16 PM
Recently, we are facing a Disk I/O performance issue. It's not possible for us to re-layout the LUN number and size.
I found some information in docs and ITRC that to increase the value ( origin is 8 ) may improve the I/O performance. And this value can be 1 ~ 255. But I just can't get any suggestions about what the exactly value shuold I set?
Would somebody please give me some direction?
Solved! Go to Solution.
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тАО03-10-2009 11:28 PM
тАО03-10-2009 11:28 PM
Re: How do I decide the value of "scsi_max_queue" in Kernel ?
http://forums13.itrc.hp.com/service/forums/questionanswer.do?threadId=1320653
please dont forget to assign points
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тАО03-10-2009 11:39 PM
тАО03-10-2009 11:39 PM
Re: How do I decide the value of "scsi_max_queue" in Kernel ?
I found another command "scsictl" can online to modify the SCSI queue. Although ... the new setting will be reset after reboot or re-enable the VG.
My question ...
Is there any risk to run this command online ?
scsictl -m queue_depth=128 /dev/rdsk/c0t6d0
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тАО03-10-2009 11:43 PM
тАО03-10-2009 11:43 PM
Re: How do I decide the value of "scsi_max_queue" in Kernel ?
Are you using Secure Path or just PVLinks?
HTH
Duncan
I am an HPE Employee
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тАО03-10-2009 11:46 PM
тАО03-10-2009 11:46 PM
Re: How do I decide the value of "scsi_max_queue" in Kernel ?
I have no Secure path installed. So should I run the command on each alternative PV link ???
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тАО03-11-2009 12:12 AM
тАО03-11-2009 12:12 AM
SolutionHTH
Duncan
I am an HPE Employee
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тАО03-11-2009 12:16 AM
тАО03-11-2009 12:16 AM