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BalkiSW

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BalkiSW

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November 5th, 2014 19:00

EMC VNX - Volume latency

Is there any way to find the file side latency( latency for a volume) via any of the management interfaces like SMI-S. XML-API or anything else?

Thanks!

  • Rainer_EMC

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    Posted November 6th, 2014 04:00

    Did you look at the server_stats CLI command ?

    Its quite powerful

  • BalkiSW

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    Posted November 7th, 2014 07:00

    I checked the server_stats command and I could not find anything related to latency.

    This is the command I tried:  server_stats server_2 -ta fsvol -i 3 -c 3 -te no

    It is reporting the following:

    1. Read Requests/s

    2. Read KiB/s

    3. Avg Read Size Bytes

    4. Read Ops/s

    5. Read Ops%

    6. Write Requests/s

    7. Write KiB/s

    8.Avg Write Size Bytes

    9. Write Ops/s

    10. Write Ops %

    Thanks!

  • Rainer_EMC

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    Posted November 7th, 2014 09:00

    When you say volume – do you mean file system ?

  • BalkiSW

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    Posted November 24th, 2014 06:00

    Yes, file system Volume

  • Rainer_EMC

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    Posted November 24th, 2014 10:00

    I dont think that is directly measured.

    Classic latency is something we measure on the block side – i.e. per LUN

    In most setups though the internal volume manager on the data mover (AVM) spreads multiple file system over multiple LUNs.

    You should be able to get some stats on the protocol level – i.e. response time for read or write for NFS or CIFS