Disk bottleneck may impact VMware LUN performance and timeouts
Applies to
- ONTAP 9
- VMware ESXi
- NFS, iSCSI, or FCP Datastores
Issue
- Significant performance issues for NFS volumes, or FCP or iSCSI LUNs on a VMWare ESXi cluster or also iSCSI LUN timeouts
- VMs are slow on reads or writes
- qos statistics shows high disk latency
- Example:
vol1
has high disk latency
- Example:
Workload ID Latency Network Cluster Data Disk QoS Max QoS Min NVRAM
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total- - 4.33ms 198.00us 9.00us 1221.00us 2.88ms 0ms 0ms 13.00us
vol1 32140 177.16ms 113.00us 226.00us 108.03ms 68.79ms 0ms 0ms 2.00us