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What is the "_ocs_vserver" workload in qos statistics?

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Applies to

  • ONTAP 9
  • ONTAP Copy Subsystem (OCS)

Answer

  • _ocs_vserver is a QoS internal workload ID for Copy Offload, known as VAAI, ODX
    • Copy offload is a process of copying data blocks without sending the data, only metadata/control data across the network
    • This may be copied from one part of a volume to another of the same volume, or another volume on the same ONTAP node/cluster
    • This is done to optimize a slow client or network by making all the computation occur on storage (ONTAP)
  • This may be identified from a Performance case, or from the command qos statistics workload resource cpu show.
  • Example:

cluster1::> qos statistics workload resource cpu show -node nodeB
Workload            ID   CPU
--------------- ------ -----
-total- (100%)       -   30%
_ocs_vserver_a3      -   20%
vs0-wid101         101   12%
file-1-wid121      121   10%
vol0-wid1002      1002    8%
_DEDUP               -    7%
-total- (100%)       -   30%
vs0-wid101         101   12%
file-1-wid121      121   10%
_ocs_vserver_a3      -   10%
vol0-wid1002      1002    8%
_DEDUP               -    7%

  • Offloading the reading of data from a source and the writing to a destination via the use of an in-band SCSI command known as EXTENDED_COPY
    • This mainly includes Storage vMotions (VMware initiated data migration)
  • For Copy Offload work, OCS creates a default QoS workload per destination vserver
  • These workloads follow a well-defined naming scheme; each workload name is of the form _ocs_vserver_<vserver UUID>, where the vserver ID is the UUID of the destination vserver.

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