High FlexGroup or FlexVol CIFS latency due to CIFS ChangeNotify fixed with share properties
Applies to
- ONTAP 9.0-9.9
- FlexGroup with CIFS workload
- FlexVol with CIFS workload
- NFS if in multiprotocol FlexGroup (Accessed through CIFS and NFS)
- Change Notify
Issue
- Elevated CIFS latency, typically for WRITE operations, but also Create, Setattr, Open, Close
- Output of
qos statistics volume latency show
shows majority of latency indata
column - Users hosted in VDI environment report slow access immediately post migrating from FlexVol to FlexGroup.
- Latency may be seen on a single constituent steady or shift between constituent volumes in rapid succession if multiple directories are read or written to