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Snapshot size increases after restoring a FlexGroup volume

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ontap-9
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core
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Applies to

  • ONTAP 9
  • FlexGroup
  • Snapshot
  • SnapMirror

Issue

After a restore via SnapMirror, if you save the same data and take a snapshot, the size will be larger.
  1. Initial state: Snapshot Snap1 is created.
Cluster::> snapshot show -vserver svm1 -volume fg1
---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm1     fg1
         snapmirror.ac47a19b-ee9b-11ef-bc5d-00a098d0b873_2160483137.2025-02-19_033710
                                                      688KB     0%    0%
         snap1                                  983.6MB     0%   50%
  1. Save a 6.5GB file.
  2. Create Snapshot Snap2. 
Cluster::> snapshot create -vserver svm1 -volume fg1 -snapshot snap2
 
The size of Snap2 is almost the same as the logical data size.
Cluster::> snapshot show -vserver svm1 -volume fg1
---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm1     fg1
         snap1                                  983.6MB     0%   13%
         snapmirror.ac47a19b-ee9b-11ef-bc5d-00a098d0b873_2160483137.2025-02-20_012822
                                                      988.2MB     0%   13%
         snap2                                   6.53GB     3%   50%
  1. Execute SnapMirror Update.
  2. Perform SnapMirror Restore using Snap1 to revert to the initial state.
  3. Save the same 6.5GB file again.
  4. Create Snapshot Snap3.
Cluster::> snapshot create -vserver svm1 -volume fg1 -snapshot snap3
 
Snapshot Snap3 is observed to be larger than Snap2.
Cluster::> snapshot show -vserver svm1 -volume fg1
---Blocks---
Vserver  Volume   Snapshot                                  Size Total% Used%
-------- -------- ------------------------------------- -------- ------ -----
svm1     fg1
         snap1                                  983.6MB     0%   12%
         snap2                                   6.53GB     3%   48%
         snapmirror.ac47a19b-ee9b-11ef-bc5d-00a098d0b873_2160483137.2025-02-20_013129
                                                       6.53GB     3%   48%
         restored.d59573cc-edc1-11ef-bc5d-00a098d0b873_2160483134.snap1.2025-02-20_013521
                                                       1.78GB     1%   20%
         snap3                                   6.94GB     3%   50%

 

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