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1 Rookie
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34 Posts
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467
March 11th, 2011 04:00
Analyzer question
I have been doing some troubleshooting and I am finding the output rather confusing.
I have a Raid group that contains 4 disks in a 2 + 2 R10 configuration
If I look at the RAID group level analyzer is showing a Total Read size KB starting at 165 KB ( the second line from the bottom)
but I have disks in that raid group that show much larger Read KB sizes.
What would explain the output when a Raid group figure is lower than the Disks Read sizes?
I would have thought that the raid group total would be equal to the combined total of the disks contained within it?
Or is this showing Host I/O on a Raid group level but showing other processes are running at a disk level ( i.e. some database process that is running but not generating Host I/O
confused
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Christoffer3
27 Posts
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March 14th, 2011 07:00
I don't have an answer to your exact question but I do know there will be discrepancies with lun/group IO statistics in regards to cache hits and such.
So it might be something related to that, but thats just my guesstimate.
//C
kelleg
6 Operator
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4.5K Posts
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March 21st, 2011 12:00
My undertanding is that the statistics for Raid Group are from the LUN. I use RG statistics to get a quick look for issues, then I look at the disks and LUNs for a more precise view.
glen.