Should Qos policy must apply both in LUN and volume ?

[AllenChang]

If I want to apply the qos policy in the LUN level

Should it must also apply in the Volume that include the LUN at the same time?

or just apply in the LUN Level only ?

[Ontapforrum]

I think it depends, whether:

• If it's a one-2-one relationship (one LUN per Volume), in this case it doesn't matter. You would rather just apply QoS at the Volume level.

• If it's going to be more LUNs (More than one LUN per volume): Then I would rather have QoS to individual LUNs.

https://docs.netapp.com/us-en/ontap-sm-classic/online-help-96-97/task_assigning_luns_to_storage_qos.html
https://docs.netapp.com/ocum-95/index.jsp?topic=%2Fcom.netapp.doc.onc-um-perf-ag%2FGUID-E4E26D82-3298-4BB0-BC33-6C626D81CDB1.html

[chenguanghui]

if  you qos policy is assigned at the volume level ,it must be changed at the volume level , at the first qos policy is assigned at the lun ,it must be changed at the lun level.

 the following article may be helpful you

https://docs.netapp.com/us-en/ontap/san-admin/edit-lun-qos-policy-task.html