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Individual snapshot size doesn't match the DF output for that volume

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ontap-9
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Applies to

  • ONTAP 9
  • Space management
    • Snapshots

Issue

  • There is a significant discrepancy between the amount of disk space that is listed in the output of the snap list and df commands.
  • Total Snapshot size from snap show and/or snap list command is smaller from size shown with df -h command for that volume.
    • Not all the volumes are affected.
    • Example output:

::> df -h -vserver svm1 -volume vol1
Filesystem               total       used      avail capacity  Mounted on                 Vserver
/vol/vol1/                18TB       16TB     1970GB      89%  /vol1                      svm1
/vol/vol1/.snapshot      972GB     2763GB         0B     284%  /vol1/.snapshot            svm1
2 entries were displayed.

::> snap list -vserver svm1 -volume vol1
                                                                 ---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm1     vol1
                  weekly.2020-02-11_2138                  1.15TB     6%   7%
                  weekly.2020-02-18_2138                 221.8GB     1%   1%
                  weekly.2020-02-25_2138                 29.49GB     0%   0%
                  weekly.2020-03-03_2138                   308KB     0%   0%
                  daily.2020-03-03_2138                    188KB     0%   0%
                  daily.2020-03-04_0010                    936KB     0%   0%
                  hourly.2020-03-04_0505                   228KB     0%   0%
7 entries were displayed.

 

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