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Why does the statistics volume show command show the total ops which do not match the read, write, and other ops?

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Applies to

ONTAP 9

Answer

  • For the newer versions of ONTAP, NFS or CIFS Volumes
    • Total Ops = Read + Write + Other + Access + Getattr + Lookup + Punch Hole + Setattr.
  • So NAS volume OTHER is actually anything other than Read, Write, Access, Getattr, Lookup, Setattr & Punch Hole.

The statistics volume show command shows the Volume layer statistics, which doesn't include breakdown of Getattr, Lookup, Access, Setattr or Punch Hole.

Example:
Cluster1::*> statistics volume show -interval 5
Cluster1 : 4/15/2021 13:08:29
                                        *Total Read Write Other    Read    Write   Latency
 Volume    Vserver            Aggregate    Ops  Ops   Ops   Ops   (Bps)    (Bps)      (us)
------- ---------- -------------------- ------ ---- ----- ----- ------- --------   -------
nasdata    svmnas          sas_aggr1     85759 3751  1314  1922 6020330   19856178      20
lun1       svmsan         sata_aggr1      8411 8312    99     0 524286336  1347968   20720

So the NAS volume total ops do not match the read, write, and other ops. But the SAN volume total ops match the read, write, and other ops.

  • For the Volume Layer (NFS or CIFS): Total Ops != Read + Write + Other Ops
  • For the Volume Layer (SAN): Total Ops = Read + Write + Other Ops

Additional Information

Follow the below steps to check the NFS detailed ops.

  1. Switch to the advanced mode on the cluster shell.

Example:
Cluster1::> set adv

  1. Start the statistics for the NFS detailed ops counters.

Example:
Cluster1::*> statistics start -sample-id testother -object volume -instance vol1 -counter nfs_read_ops|nfs_write_ops|nfs_other_ops|nfs_access_ops|nfs_getattr_ops|nfs_lookup_ops|nfs_total_ops

Statistics collection is being started for sample-id: testother

  1. Wait for several minutes, then stop the statistics sample.

Example:
Cluster1::*> statistics stop -sample-id testother

Statistics collection is being stopped for sample-id: testother

  1. Check the NFS detailed ops.

Example:
Cluster1::*> statistics show -sample-id testother

Object: volume
Instance: vol1
Start-time: 4/16/2021 19:19:10
End-time: 4/16/2021 19:19:25
Elapsed-time: 15s
Scope: svm1
    Counter                                                     Value
    -------------------------------- --------------------------------
    nfs_access_ops                                                  0
    nfs_getattr_ops                                                 0
    nfs_lookup_ops                                                  0
    nfs_other_ops                                                   0
    nfs_read_ops                                                    0
    nfs_total_ops                                                   0
    nfs_write_ops                                                   0
7 entries were displayed.

5. Change back to admin mode.

Example:
Cluster1::> set admin

Related KB:

What operations are categorized under Other IOPS in ONTAP?

 

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