[GitHub] [cloudstack] weizhouapache commented on issue #6827: Zero size recurring snapshots piling up after server is shutdown

["weizhouapache (via GitHub)" <gi...@apache.org>]

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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