Why is there a size mismatch between my FSx for ONTAP file system and the NFS client when I use quotas?
When I use quotas, there's a size mismatch between my Amazon FSx for NetApp ONTAP file system and the Linux Network File System (NFS) client.
Resolution
The Linux NFS client where you mounted your volumes sees a size mismatch with the FSx for ONTAP file system in the following scenarios:
- You didn't configure the hard disk quota for the qtree.
- The available space that's in the volume is less than the remaining tree quota space.
In these scenarios, when you run the df command on the client, the command's calculation uses the quota in the qtree. To calculate the volume size, the command adds the available space that's in the volume to the quota that's in the qtree. As a result, the output from the df command shows a size mismatch between the client and the file system. For more information, see How the df command accounts for file size on the NetApp website.
Example
In the following example, the df command output shows a size mismatch between the FSX for ONTAP file system and the Linux NFS client.
1. To check the size of the aggregate and its volumes, run the df and volume show commands:
::> df -A -h -aggregate aggr1 Aggregate total used avail capacity aggr1 861GB 1655MB 860GB 0% aggr1/.snapshot 45GB 20KB 45GB 0% 2 entries were displayed.
::> volume show Vserver Volume Aggregate State Type Size Available Used% --------- ------------ ------------ ---------- ---- ---------- ---------- ----- fsx fsx_root aggr1 online RW 1GB 972.0MB 0% fsx vol1 aggr1 online RW 300GB 285.0GB 0% fsx vol2 aggr1 online RW 2.93TB 860.1GB 0% 3 entries were displayed.
In the preceding example, the size of vol1 is 300 GB and the size of vol2 is 2.93 TB.
2 To see the qtree details, run the volume qtree show, volume quota policy, and volume quota show commands:
::> volume qtree show -vserver fsx Vserver Volume Qtree Style Oplocks Status ---------- ------------- ------------ ------------ --------- -------- fsx fsx_root "" unix enable normal fsx vol1 "" unix enable normal fsx vol1 q1 mixed enable normal fsx vol2 "" unix enable normal fsx vol2 q2 mixed enable normal 5 entries were displayed.
::> volume quota policy rule show Vserver: fsx Policy: default Volume: vol1 Soft Soft User Disk Disk Files Files Type Target Qtree Mapping Limit Limit Limit Limit Threshold ----- -------- ------- ------- -------- ------- ------ ------- --------- tree "" "" - 250GB - - - - tree q1 "" - 250GB - - - - Vserver: fsx Policy: default Volume: vol2 Soft Soft User Disk Disk Files Files Type Target Qtree Mapping Limit Limit Limit Limit Threshold ----- -------- ------- ------- -------- ------- ------ ------- --------- tree "" "" - 1.46TB - - - - tree q2 "" - 1.46TB - - - - 4 entries were displayed.
::> volume quota show Scan Vserver Volume State Status --------- ------------ --------------- ------ fsx fsx_root off - fsx vol1 on - fsx vol2 on - 3 entries were displayed.
In the preceding examples, vol1 has a Disk Limit of 250GB and vol2 has a Disk Limit of 1.46TB. Quotas are applied.
3. At the operating system (OS) level, mount the volume, and then run the df command to check its space:
# df -Th Filesystem Type Size Used Avail Use% Mounted on devtmpfs devtmpfs 4.0M 0 4.0M 0% /dev tmpfs tmpfs 453M 0 453M 0% /dev/shm tmpfs tmpfs 182M 416K 181M 1% /run /dev/nvme0n1p1 xfs 8.0G 1.6G 6.5G 19% / tmpfs tmpfs 453M 0 453M 0% /tmp svm-dns-name:/vol1/q1 nfs4 250G 0 250G 0% /data1 svm-dns-name:/vol2/q2 nfs4 861G 0 861G 0% /data2 tmpfs tmpfs 91M 0 91M 0% /run/user/0
In the preceding example, the size of vol1 matches the Disk Limit size in the FSx for ONTAP file system. The Disk Limit for vol2 doesn't match.
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