Tape/NDMP Backup jobs can cause high Node utilization/latency
Applies to
- ONTAP 9
- NDMP ( Network Data Management Protocol)
Issue
- High ONTAP Node utilization when
Tape/NDMPBackup is running. - This workload can induce high CPU and Disk utilization causing CPU/Disk saturation.
- This can have a negative impact on other user workloads as they would starve for resources.
- This can lead to slow backup as well.
- High Disk latency/utilization on aggregates that have Active Tape/NDMP Backup jobs running that can take too much time to complete.
- Top contributor for Disk/CPU utilization would list Tape backup.
- The issue exists with all volumes within a specific aggregate
Example: The following commands show high disk latency or Data latency while a volume move is running
nas1::> qos statistics volume latency show -volume data -vserver data_svm3
Workload ID Latency Network Cluster Data Disk QoS
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------
-total- - 0.00us 0.00us 0.00us 000.00us 0ms 0ms
data-wid307 307 300.00ms 0.00us 0ms 150.00ms 150.00ms 0ms
-total- - 0.00us 0.00us 0.00us 000.00us 0ms 0ms
data-wid307 307 892.00ms 0.00us 0ms 92.00ms 800.00ms 0ms
-total- - 0.00us 0.00us 0.00us 000.00us 0ms 0ms
data-wid307 307 125.00ms 0.00us 0ms 25.00ms 100.00ms 0ms
-total- - 0.00us 0.00us 0.00us 000.00us 0ms 0ms
data-wid307 307 332.00ms 0.00us 0ms 300.00ms 32.00ms 0ms
nas1::> vserver services ndmp status
Session
Vserver Id
------------------ ------------
data_svm1 1000:7445
data_svm2 1000:7446
data_svm3 1000:7447