Available space is reported as less than expected for a thin provisioned volume
Applies to
- ONTAP 9
- Thin provisioned volumes
Issue
- It is normally expected that the volume available size = total size - used size, however, for a thin provisioned volume sometimes the available size is reported as less than the value of (total size - used size).
cluster1::> df -h
Filesystem total used avail capacity Mounted on Vserver
/vol/vol1/ 972GB 200GB 524GB 20% /vol1 svm1
/vol/vol1/.snapshot 0 0 0 0% /vol/vol1/.snapshot svm1
or
cluster1::> df -h
Filesystem total used avail capacity Mounted on Vserver
/vol/vol2/ 825GB 42GB 0 5% /vol/vol2 svm1
/vol/vol2/.snapshot 0 0 0 0% /vol/vol2/.snapshot svm1
- If the capacity is less than 5%, the following event appears.
[XXXX: wafl_spcd_main: monitor.volume.nearlyFull:error]: Volume XXXX is nearly full (using or reserving 95%% of space and 0%% of inodes).
- Access denial occurs once the avail size of the volume is 0.