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Are performance counters on SAN disks accurate?

Answered Are performance counters on SAN disks accurate?

  • Monday, January 28, 2013 12:51 PM
     
     
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    Hi people,

    I was wondering how accurate performance counters are pertaining to measuring disks that are provisioned in the same disk group/array in SAN storage.

    For example, in the SAN storage, there are 4 hard disks running raid 10. Within this array, 2 logical volumes are created and attached to windows server as disk A & B.

    So let's say i put physical disk counters like idle time or queue length on both disk A & B, should it report same results since they eventually belongs to the same array?

    -wt

     

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  • Monday, January 28, 2013 12:58 PM
     
     
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    Hiya,

    they will not show same results, as they will work differently.

    In general. Using O/S performance counters will give you the O/S perspective of things. It might look different from the SAN itself. Also bad performance on SAN disks might not be a disk issue by it self.

     
  • Monday, January 28, 2013 1:16 PM
     
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    If you want the perfect counters then you can use the software that comes with the hardware device.

    http://www.arabitpro.com