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