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Snapshot size sum does not match volume field space-used-by-snapshots

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Category:
ontap-9
Specialty:
core
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Applies to

ONTAP 9

Issue

  • Field size-used-by-snapshots on volume does not match summed up per-snapshot size:
::>vol show
vserver          volume       size-used-by-snapshots
---------------- ------------ ----------------------
svm1             vol1             100GB

 
::> snapshot show -vserver svm1 -volume vol1
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm1     vol1     daily.2021-08-12_0010                  50.00GB     0%    0%
                  daily.2021-08-13_0010                   4.00MB     0%    0%
                  vserverdr.0.xxx.2021-08-13_091500      25.00GB     0%    0%
                  vserverdr.1.xxx.2021-08-13_093000        220KB     0%    0%
4 entries were displayed.

 
  • Node shell command snap status shows some or all snapshots in status creating:
::> system node run -node <node_with_volume> -command "snap status  vol1" snapid status     date           ownblks release fsRev name
------  ------     ------------   ------- ------- ----- --------
213     creating   Aug 13 09:30        55     9.7 35092 vvserverdr.1.xxx.2021-08-13_093000 (53436/53516 remaining)
212     creating   Aug 13 09:15  15610097     9.7 35092 vvserverdr.0.xxx.2021-08-13_091500 (53436/53516 remaining)
150     creating   Aug 13 00:10      1041     9.7 35092 daily.2021-08-13_0010  (53436/53516 remaining)
113     creating   Aug 13 00:10   1858934     9.7 35092 daily.2021-08-12_0010
  • Node shell command wafl scan status shows some scans with a low scan ID which are long-running :

::> system node run -node <node_with_volume> -command "wafl scan status vol1"

Volume vol1:
Scan id                   Type of scan     progress
  132590     snap create summary update     block 729 of 395662
      10     blocks used summary update     block 1592 of 395662

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