The value of the disk space that is displayed in a quota report for a volume on the storage system can be different from the value displayed by the output of the df command executed from the storage system for the same volume if the particular volume has CIFS sparse files.
The difference in the space usage values is because of the difference in methods followed by the quota report and the df command for calculating the empty data blocks in the CIFS sparse files.
When you run the df command on a volume containing CIFS sparse files, the empty data blocks in the sparse files are not counted towards the disk space. However, the quota report considers all the data blocks of the sparse files, including the empty blocks, while calculating the space usage. Therefore, the disk usage reported by the df command is less than the value reported by a quota report in case of volumes containing CIFS sparse files.
system1>quota report
K-Bytes Files
Type ID Volume Tree Used Limit Used Limit Quota Specifier
----- -------- -------- -------- --------- --------- ------- ------- ---------------
tree user1 vol1 q1 209900230 - 4373805 - /vol/vol1/q1
...
If vol1 has CIFS sparse files, the space usage for the same volume by means of the df command can be 100 GB less than the value specified in the quota report, as shown in the following example:system1>df -V vol1 Filesystem kbytes used avail capacity Mounted on /vol/vol1/ 367186630 105042630 262329030 28% /vol/vol1/
