Hi there
thank you for your help
Answers are:-
1) Could you let us know the ONTAP version ? V9.5P3
2) Is the LUN on Spinning disk/Hybrid/SSD ? all on SSD
3) Is the Volume containing the LUN "compressed" ? No
4) During this restore - Do you have any replication or any other restores running in background ?
No all other jobs on that volume/SVM suspended during restore.
Node/Cluster will be running other replication jobs on different SVMs
5) Could you share the resource utilization data for the Cluster Node/Volume (Latency/Mbs) during the restore process from OCUM/AIQM ?
Whilst the restore is in progress I see the Latency increase on the node(s) that are involved in the current restore from nominally <1mS to upto 100mS this is not R or W latency but shown as Others in the performance tab for the node. once the restore is complete the Latency drops to normal
We suspected the Others refers to inter-node network traffic so have moved the volumes around to make each restore an on node memory copy (4 nodes in cluster) this is being tested at present but at the moment does not seem to have improved the overall restore duration.