weizhouapache commented on issue #6827:
URL: https://github.com/apache/cloudstack/issues/6827#issuecomment-1429413712
what I understand, if the volume is not changed after last snapshot, then do
not create snapshot.
For example, in a period,
- disk is not attached
- disk is attached but vm is stopped
Each volume has the following info in database
```
attached: NULL
updated: 2023-02-13 09:03:59
removed: NULL
state: Ready
```
Each vm instance has the info
```
update_time: 2023-02-08 13:49:22
created: 2023-01-21 15:42:52
removed: NULL
...
power_state: PowerOn
power_state_update_time: 2023-02-13 17:06:59
power_state_update_count: 3
power_host: 1
```
for snapshots
```
uuid: ad841072-70f0-4761-90af-6a718a06872a
snapshot_type: 4
type_description: DAILY
size: 8589934592
created: 2023-01-05 00:13:21
removed: NULL
backup_snap_id: NULL
swift_id: NULL
sechost_id: NULL
prev_snap_id: NULL
```
I think it is feasible based on the information above.
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