CONTAP-57441: Upgrade to ONTAP 9.8 might increase in Snapshot size on FlexGroup volumes

Last updated

May 6, 2025
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Views:: 50

Visibility:: Customer

Votes:: 0

Category:: ontap-9

Specialty:: CORE

Last Updated:: 5/6/2025, 2:09:45 PM

Issue

After upgrading to ONTAP 9.8+, a massive increase in reported Snapshot size is seen.

Before upgrade

     ::> df -h fg*
     Filesystem                    total       used      avail capacity
     /vol/fg_vol/                 3420GB      253GB     3166GB       7%
     /vol/fg_vol/.snapshot         180GB      6003MB     174GB       3%
     ::> snapshot show fg*
                                                                      ---Blocks---
     Vserver  Volume   Snapshot                                  Size Total% Used%
      -------- -------- ------------------------------------- -------- ------ -----
     svm1     fg_vol
                  daily.2021-03-24_0010                   3.93GB     0%    2%
                  daily.2021-03-25_0010                   1.19GB     0%    0%
                  hourly.2021-03-25_1205                 693.5MB     0%    0%
                  hourly.2021-03-25_1305                 44.07MB     0%    0%
                  hourly.2021-03-25_1405                  5.46MB     0%    0%
                  hourly.2021-03-25_1505                  5.46MB     0%    0%
                  hourly.2021-03-25_1605                  5.44MB     0%    0%
                  hourly.2021-03-25_1705                  5.40MB     0%    0%

After upgrade

     ::> df -h fg*
     Filesystem                total       used      avail capacity
     /vol/fg_vol/             3420GB      253GB     3166GB       7%
     /vol/fg_vol/.snapshot     180GB     5994MB      174GB       3%
     ::> snapshot show fg*
                                                                      ---Blocks---
     Vserver  Volume   Snapshot                                  Size Total% Used%
     -------- -------- ------------------------------------- -------- ------ -----
     svm1     fg_vol
                  daily.2021-03-24_0010                  234.7GB     7%   48%
                  daily.2021-03-25_0010                    253GB     7%   50%
                  hourly.2021-03-25_1505                 251.2GB     7%   50%
                  hourly.2021-03-25_1605                 251.2GB     7%   50%
                  hourly.2021-03-25_1705                 251.2GB     7%   50%
                  hourly.2021-03-25_1805                 251.2GB     7%   50%
                  hourly.2021-03-25_1905                 251.2GB     7%   50%
                  hourly.2021-03-25_2005                 251.2GB     7%   50%

The same is not seen at the FlexGroup constituent level.