What is the "_ocs_vserver" workload in qos statistics?
Applies to
- ONTAP 9
- ONTAP Copy Subsystem (OCS)
Answer
_ocs_vserveris 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.
Additional Information