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November 22nd, 2011 07:00
Vmax virtual provisioned lun IOPS
Hello guys,
I have a lun going to an ESX host having performance degradation.
I want to find out how to calculate IOPS for a lun built from a vmax pool
The Sata pool is made out of 200 Data devices
Drives are in a raid 6, 6+2 , 1TB 7200 drives.
Do the old calculations work? Number of drives for Raid 6 = Number of reads + 6*number of writes / 80 for Sata drives
How do you guys calculate performance for virtual provisioned luns ?
I do see response time spikes and over 400 IOPS going to that lun during peak time.
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reseach
2 Intern
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225 Posts
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November 23rd, 2011 23:00
I like to put extra 10-15% space on the result of this calculation due to the overhead of pool technical. Although pool technology would distribute IO on the device of a pool evenly, it also would break seq IO to Random IO and more CPU/RAM consumption as tradeoff.
Eddy
SKT2
2 Intern
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1.3K Posts
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December 5th, 2011 13:00
200(6+2)= 25; what is the tdat size you have? is your tdev a single device or meta?
Jingyi1
2 Intern
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199 Posts
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December 15th, 2011 01:00
It's really hard to tell from the information you gave. One factor is performance depends on how many disks this pool has extended to. I guess this LUN is not the only LUN in this pool, if that's the case, you won't get the full performance from all disks.
mattcowger1
61 Posts
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December 15th, 2011 12:00
It would be reasonable to test this using VMware's new IO Analyzer fling: http://labs.vmware.com/flings/io-analyzer
It should give you a reasonable idea of what your LUN(s) can do.