Delay in finishing backups

S

sergioposadam

New Member
Feb 3, 2025
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0
1
Hello

I am having issues when I try to run several scheduled backups. For example, with the first VM, once the backup data copying is complete, it takes a long time to formally finish the backup. In this case, it takes 22 minutes and 55 seconds to complete the data copy and then an additional 22 minutes and 15 seconds for "Waiting for server to finish backup validation...". Do you know what it is doing during this time? How can I improve it? Because it does not finish this task, it does not start the next backup.

Code: 
INFO:  99% (496.9 GiB of 500.0 GiB) in 22m 52s, read: 199.9 MiB/s, wINFO:  99% (496.9 GiB of 500.0 GiB) in 22m 52s, read: 199.9 MiB/s, write: 37.0 MiB/s
INFO: 100% (500.0 GiB of 500.0 GiB) in 22m 55s, read: 1.0 GiB/s, write: 0 B/s
INFO: Waiting for server to finish backup validation...
INFO: backup is sparse: 398.86 GiB (79%) total zero data
INFO: backup was done incrementally, reused 459.60 GiB (91%)
INFO: transferred 500.00 GiB in 2706 seconds (189.2 MiB/s)
INFO: adding notes to backup
INFO: Finished Backup of VM 102 (00:45:10)rite: 37.0 MiB/s

The next VM is similar. Copying data took 24m 35s, but waiting for the server to finish the backup task took 35m 20s.

Code: 
INFO:  98% (137.4 GiB of 140.0 GiB) in 24m 32s, read: 2.9 GiB/s, write: 0 B/s
INFO: 100% (140.0 GiB of 140.0 GiB) in 24m 35s, read: 874.7 MiB/s, write: 0 B/s
INFO: Waiting for server to finish backup validation...
INFO: backup is sparse: 53.46 GiB (38%) total zero data
INFO: backup was done incrementally, reused 105.11 GiB (75%)
INFO: transferred 140.00 GiB in 3593 seconds (39.9 MiB/s)
INFO: adding notes to backup
INFO: Finished Backup of VM 103 (00:59:55)
 
I just found that it seems the backup could be syncing with the datastore. https://pbs.proxmox.com/docs/storage.html#options I have tried to change chunk-order and sync-level but haven't improved the times:

Code: 
INFO:  99% (9.6 GiB of 9.7 GiB) in 9m 6s, read: 17.3 MiB/s, write: 16.7 MiB/s
INFO: 100% (9.7 GiB of 9.7 GiB) in 9m 12s, read: 14.7 MiB/s, write: 14.7 MiB/s
INFO: backup was done incrementally, reused 130.43 GiB (93%)
INFO: transferred 9.71 GiB in 2795 seconds (3.6 MiB/s)
INFO: adding notes to backup
INFO: Finished Backup of VM 103 (00:46:37)
 
Last edited:
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