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тАО07-02-2001 11:56 AM
тАО07-02-2001 11:56 AM
12H AutoRaid, checking load on each controller
Currently one volume group is set to use the path of one controller and the other 4 VGs are using the other controller path. I want to spread the load out better. I know how to do this, but is there a way to measure the load on each controller and track the performance gains after switching one of the volume groups? I could add up the IO of each LUN, but I'm looking for a better, more accurate way to do this either through Measureware/Glance or the AutoRaid software.
Thanks and I will assign points. -Bernie
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тАО07-02-2001 12:45 PM
тАО07-02-2001 12:45 PM
Re: 12H AutoRaid, checking load on each controller
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тАО07-03-2001 09:28 AM
тАО07-03-2001 09:28 AM
Re: 12H AutoRaid, checking load on each controller
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тАО07-03-2001 11:19 AM
тАО07-03-2001 11:19 AM
Re: 12H AutoRaid, checking load on each controller
Would 'arraydsp -m' (for performance metrics) be of some help?
arraydsp -m starttime endtime array-id
Or, 'arraydsp -r' for Autoraid-generated recommendations.
Good Luck,
Curt
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тАО07-04-2001 03:34 AM
тАО07-04-2001 03:34 AM
Re: 12H AutoRaid, checking load on each controller
It's the same problem trying to find the load on any scsi targettable device.
iostat for example is only going to class on disk io.. the d field of the sdisk dev file.
I would imagine the only way to get any usefull information related to the controller is via arraydsp -c
The performance metrics and recommendations I have found to be rather useless. You should concentrate more on the disk/lun io through the controllers rather than the controller itself, afterall there's not mich you can do.. everything is mirrored even on the controllers.
(apart from reads)
You can play around with the arramgr -J option but comprimise true HA versus performance.
LVM balancing is the true analysis method, using perfview and glance and so on.. you then decide to access on the other bus via the other controller.
Later,
Bill
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тАО07-05-2001 04:53 AM
тАО07-05-2001 04:53 AM
Re: 12H AutoRaid, checking load on each controller
Bill, you basically are confirming what I expected, that there really is no way to track and measure the load of the controller devices, just the disk devices themselves. And I agree that the metrics don't do me a whole lot of good either. I will just concentrate of the disks themselves, checking the load on each and making sure it is split as evenly as possible between the 2 controller until I have an opportunity to do this the right way and make both controllers evenly used all the time.