Can QoS for IOPS be applied or assigned to a Volume that is being accessed by the client ?

Hi All,

Can QoS be appied (For max IOPS) dynamically ? While the clients are accessing the volume be it CIFS or NFS ?

Do I need to stop the CIFS service or NFS service first,  and then apply the QoS IOPS Policy, and reestart the Protocol service ?

In a simple simulator test on ONTAP 9.4 : I was copying a large file, and it was consuming most of the IOPS available to it. When I assigned QoS policy for [100 IOPS}, it did not ahered to it.

However, once the copy was over, I re-assigned the Policy (IOPS 100)  and started another copy and this time I could see constant IOPS of 110. I did not have to stop the CIFS service, as this is a SIMULATOR and I knew it's just one activity, so it was simple.

Does anyone has more insight ?

Thanks,

-Ash