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QoS Statistics command output - What is System-Default?

pedro_rocha

Hello!

In the following extract, what accounts for System-Default?

STG::> qos statistics workload resource cpu show -node STG-01 -rows 20
Workload ID CPU
--------------- ----- -----
-total- (100%) - 93%
System-Default 1 37%
User-Default 2 24%
_WAFL 7 11%
_Efficiency_B.. 7501 5%
_SIS_CLONE_SP.. 20 1%
_SNAPMIRROR 15 1%
_WAFL_SCAN 19 1%

Kind regards,

Pedro Rocha

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Accepted answers

paul_stejskal

Correct. It will use 100% of whatever 1-5% of CPU is actually in use. Since they normally are idle processes unless called upon, this will appear to be higher. Either way, it is completely normal/working as intended.

All comments

aladd

There is a KB that partially explains this, although it is listed as "system-defined" and "user-defined" in the KB article to describe these two outputs.

https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/FAQ%3A_Storage_Quality_of_Service_(QoS)

Workload:

User-defined workload
Represents the input/output (I/O) operations from clients to a storage object that belongs to a policy group. A storage object is one of the following:
- A Vserver with FlexVol volumes
- A FlexVol volume
- A LUN
- A file (typically represents a virtual machine)
  I/O to storage objects that are not assigned to policy groups belong to the 'User-Default' workload.
System-defined workload
Represents internal work that the cluster performs. Storage QoS controls specific system operations to prevent them from interfering with client operations. Examples include storage efficiency operations and data replication operations.

Hope this helps!

paul_stejskal

System default is anything internal to WAFL basically, or ONTAP. If you have an idle system you're more likely to see it. Basically we have internal QoS workloads for deduplication, SnapMirror, etc., but there are some internal workloads that just don't have a QoS workload assigned, so we put them in a default bucket.

pedro_rocha

Hello Paul,

So on an idle system, the system-default tends to be higher. Is that it?

Regards,

Pedro Rocha

paul_stejskal