random guest crash during backup with PBS

G

giorgioandreoletti

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Proxmox Subscriber
Jan 1, 2025
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Hello! This is my first post here; thanks to anyone who will be give me any advice!
I'm running two production VE server on two DELL R540 server (each equipped with 128GB ram, 4x1TB SSD with ZFS RAID10, 2x Gold 6130), with a total of 8 VM (all Linux, some Debians and some Centos), I recently bought another server in an another datacenter to run PBS (2x1TB SSD for PBS and 4x22TB SATA disks in ZFS RAID10 for backup storage, 64GB ram, 32 cores).
Everithing is setup and running, I have about ten backups for each VM, in snapshot mode. All the PVE and PBS server has been installed in Dev 2024 and are up-to-date.

My issue is that I'm experiencing random freezes of the guest OS during backups.
Today, for example: the scheduled job runs the backup for VM106 and it freezed (I coult still login via SSH but every shell command took several minutes to complete, including the login itself). I stop the backup via PBS web console; I reboot the guest OS. I run a backup manually from the PVE web console and it works without any freeze.
Also today: scheduled backup of VM103 goes well, then I try a manual backup and it freezes the host. It really looks a "random" thing,
No errors on journalctl, no errors on PBS or VE consoles.
In other words: VM106 is a production web server with about 200 web sites and they were all not responding (timeout) during the scheduled backup; during the manual backup they where running smootly. The exact opposite with VM103 (scheduled ok, manual freezes). I experience this random behaviour on all VMs.

This is the failed scheduled backup, which was running but I had to stop it because freezing the server is not acceptable:

Code: 
106: 2025-01-01 21:00:13 INFO: Starting Backup of VM 106 (qemu)
106: 2025-01-01 21:00:13 INFO: status = running
106: 2025-01-01 21:00:13 INFO: VM Name: srv5
106: 2025-01-01 21:00:13 INFO: include disk 'scsi0' 'local-zfs:vm-106-disk-0' 70G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi1' 'local-zfs:vm-106-disk-1' 200G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi2' 'local-zfs:vm-106-disk-2' 20G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi3' 'local-zfs:vm-106-disk-3' 20G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi4' 'local-zfs:vm-106-disk-4' 20G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi5' 'local-zfs:vm-106-disk-5' 50G
106: 2025-01-01 21:00:13 INFO: include disk 'scsi6' 'local-zfs:vm-106-disk-6' 50G
106: 2025-01-01 21:00:13 INFO: backup mode: snapshot
106: 2025-01-01 21:00:13 INFO: ionice priority: 7
106: 2025-01-01 21:00:13 INFO: creating Proxmox Backup Server archive 'vm/106/2025-01-01T20:00:13Z'
106: 2025-01-01 21:00:16 INFO: started backup task 'de971a8e-45ab-4192-a341-7efbc0a292c3'
106: 2025-01-01 21:00:16 INFO: resuming VM again
106: 2025-01-01 21:00:16 INFO: scsi0: dirty-bitmap status: OK (23.1 GiB of 70.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: scsi1: dirty-bitmap status: OK (5.6 GiB of 200.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: scsi2: dirty-bitmap status: OK (568.0 MiB of 20.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: scsi3: dirty-bitmap status: OK (drive clean)
106: 2025-01-01 21:00:16 INFO: scsi4: dirty-bitmap status: OK (324.0 MiB of 20.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: scsi5: dirty-bitmap status: OK (13.6 GiB of 50.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: scsi6: dirty-bitmap status: OK (800.0 MiB of 50.0 GiB dirty)
106: 2025-01-01 21:00:16 INFO: using fast incremental mode (dirty-bitmap), 44.0 GiB dirty of 430.0 GiB total
106: 2025-01-01 21:00:19 INFO:   0% (76.0 MiB of 44.0 GiB) in 3s, read: 25.3 MiB/s, write: 25.3 MiB/s
106: 2025-01-01 21:07:05 INFO:   1% (504.0 MiB of 44.0 GiB) in 6m 49s, read: 1.1 MiB/s, write: 1.1 MiB/s
106: 2025-01-01 21:08:16 ERROR: interrupted by signal
106: 2025-01-01 21:08:16 INFO: aborting backup job
106: 2025-01-01 21:08:16 INFO: resuming VM again
106: 2025-01-01 21:08:16 ERROR: Backup of VM 106 failed - interrupted by signal

and this is the same backup that I manually run from the web console few minutes later, without any freezes:

Code: 
vzdump 106 --mode snapshot --node d00sug-antworksprox --storage backup --remove 0 --notes-template '{{guestname}}' --notification-mode auto

106: 2025-01-01 21:23:56 INFO: Starting Backup of VM 106 (qemu)
106: 2025-01-01 21:23:56 INFO: status = running
106: 2025-01-01 21:23:56 INFO: VM Name: srv5
106: 2025-01-01 21:23:56 INFO: include disk 'scsi0' 'local-zfs:vm-106-disk-0' 70G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi1' 'local-zfs:vm-106-disk-1' 200G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi2' 'local-zfs:vm-106-disk-2' 20G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi3' 'local-zfs:vm-106-disk-3' 20G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi4' 'local-zfs:vm-106-disk-4' 20G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi5' 'local-zfs:vm-106-disk-5' 50G
106: 2025-01-01 21:23:56 INFO: include disk 'scsi6' 'local-zfs:vm-106-disk-6' 50G
106: 2025-01-01 21:23:56 INFO: backup mode: snapshot
106: 2025-01-01 21:23:56 INFO: ionice priority: 7
106: 2025-01-01 21:23:56 INFO: creating Proxmox Backup Server archive 'vm/106/2025-01-01T20:23:56Z'
106: 2025-01-01 21:23:58 INFO: started backup task 'd4d020b5-9cf4-4a38-9885-a35e644ee63f'
106: 2025-01-01 21:23:58 INFO: resuming VM again
106: 2025-01-01 21:23:58 INFO: scsi0: dirty-bitmap status: OK (23.2 GiB of 70.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: scsi1: dirty-bitmap status: OK (5.6 GiB of 200.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: scsi2: dirty-bitmap status: OK (684.0 MiB of 20.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: scsi3: dirty-bitmap status: OK (drive clean)
106: 2025-01-01 21:23:58 INFO: scsi4: dirty-bitmap status: OK (324.0 MiB of 20.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: scsi5: dirty-bitmap status: OK (13.6 GiB of 50.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: scsi6: dirty-bitmap status: OK (800.0 MiB of 50.0 GiB dirty)
106: 2025-01-01 21:23:58 INFO: using fast incremental mode (dirty-bitmap), 44.1 GiB dirty of 430.0 GiB total
106: 2025-01-01 21:24:01 INFO:   0% (348.0 MiB of 44.1 GiB) in 3s, read: 116.0 MiB/s, write: 112.0 MiB/s
106: 2025-01-01 21:24:04 INFO:   2% (948.0 MiB of 44.1 GiB) in 6s, read: 200.0 MiB/s, write: 146.7 MiB/s
106: 2025-01-01 21:24:07 INFO:   3% (1.3 GiB of 44.1 GiB) in 9s, read: 141.3 MiB/s, write: 136.0 MiB/s
106: 2025-01-01 21:24:10 INFO:   4% (1.8 GiB of 44.1 GiB) in 12s, read: 164.0 MiB/s, write: 164.0 MiB/s
106: 2025-01-01 21:24:13 INFO:   5% (2.4 GiB of 44.1 GiB) in 15s, read: 194.7 MiB/s, write: 156.0 MiB/s
106: 2025-01-01 21:24:16 INFO:   6% (2.9 GiB of 44.1 GiB) in 18s, read: 177.3 MiB/s, write: 161.3 MiB/s
106: 2025-01-01 21:24:19 INFO:   7% (3.5 GiB of 44.1 GiB) in 21s, read: 189.3 MiB/s, write: 189.3 MiB/s
106: 2025-01-01 21:24:22 INFO:   9% (4.0 GiB of 44.1 GiB) in 24s, read: 185.3 MiB/s, write: 185.3 MiB/s
106: 2025-01-01 21:24:25 INFO:  10% (4.5 GiB of 44.1 GiB) in 27s, read: 156.0 MiB/s, write: 156.0 MiB/s
106: 2025-01-01 21:24:28 INFO:  11% (5.0 GiB of 44.1 GiB) in 30s, read: 173.3 MiB/s, write: 173.3 MiB/s
106: 2025-01-01 21:24:31 INFO:  12% (5.3 GiB of 44.1 GiB) in 33s, read: 126.7 MiB/s, write: 126.7 MiB/s
106: 2025-01-01 21:24:34 INFO:  13% (5.8 GiB of 44.1 GiB) in 36s, read: 160.0 MiB/s, write: 158.7 MiB/s
106: 2025-01-01 21:24:39 INFO:  14% (6.3 GiB of 44.1 GiB) in 41s, read: 100.8 MiB/s, write: 100.8 MiB/s
106: 2025-01-01 21:24:42 INFO:  15% (6.7 GiB of 44.1 GiB) in 44s, read: 145.3 MiB/s, write: 145.3 MiB/s
106: 2025-01-01 21:24:45 INFO:  16% (7.3 GiB of 44.1 GiB) in 47s, read: 180.0 MiB/s, write: 174.7 MiB/s
106: 2025-01-01 21:24:48 INFO:  17% (7.7 GiB of 44.1 GiB) in 50s, read: 145.3 MiB/s, write: 145.3 MiB/s
106: 2025-01-01 21:24:51 INFO:  18% (8.3 GiB of 44.1 GiB) in 53s, read: 198.7 MiB/s, write: 157.3 MiB/s
106: 2025-01-01 21:24:54 INFO:  19% (8.7 GiB of 44.1 GiB) in 56s, read: 150.7 MiB/s, write: 94.7 MiB/s
106: 2025-01-01 21:24:57 INFO:  21% (9.3 GiB of 44.1 GiB) in 59s, read: 198.7 MiB/s, write: 166.7 MiB/s
106: 2025-01-01 21:25:00 INFO:  22% (9.9 GiB of 44.1 GiB) in 1m 2s, read: 209.3 MiB/s, write: 169.3 MiB/s
106: 2025-01-01 21:25:03 INFO:  23% (10.5 GiB of 44.1 GiB) in 1m 5s, read: 198.7 MiB/s, write: 144.0 MiB/s
106: 2025-01-01 21:25:06 INFO:  25% (11.1 GiB of 44.1 GiB) in 1m 8s, read: 194.7 MiB/s, write: 178.7 MiB/s
106: 2025-01-01 21:25:09 INFO:  26% (11.7 GiB of 44.1 GiB) in 1m 11s, read: 220.0 MiB/s, write: 145.3 MiB/s
106: 2025-01-01 21:25:12 INFO:  27% (12.3 GiB of 44.1 GiB) in 1m 14s, read: 190.7 MiB/s, write: 190.7 MiB/s
106: 2025-01-01 21:25:15 INFO:  29% (12.8 GiB of 44.1 GiB) in 1m 17s, read: 188.0 MiB/s, write: 188.0 MiB/s
106: 2025-01-01 21:25:18 INFO:  30% (13.4 GiB of 44.1 GiB) in 1m 20s, read: 194.7 MiB/s, write: 184.0 MiB/s
106: 2025-01-01 21:25:21 INFO:  31% (14.0 GiB of 44.1 GiB) in 1m 23s, read: 196.0 MiB/s, write: 182.7 MiB/s
106: 2025-01-01 21:25:24 INFO:  32% (14.5 GiB of 44.1 GiB) in 1m 26s, read: 178.7 MiB/s, write: 170.7 MiB/s
106: 2025-01-01 21:25:27 INFO:  33% (15.0 GiB of 44.1 GiB) in 1m 29s, read: 166.7 MiB/s, write: 157.3 MiB/s
106: 2025-01-01 21:25:30 INFO:  34% (15.4 GiB of 44.1 GiB) in 1m 32s, read: 152.0 MiB/s, write: 148.0 MiB/s
106: 2025-01-01 21:25:33 INFO:  36% (16.0 GiB of 44.1 GiB) in 1m 35s, read: 185.3 MiB/s, write: 184.0 MiB/s
106: 2025-01-01 21:25:36 INFO:  37% (16.5 GiB of 44.1 GiB) in 1m 38s, read: 192.0 MiB/s, write: 174.7 MiB/s
106: 2025-01-01 21:25:39 INFO:  38% (16.9 GiB of 44.1 GiB) in 1m 41s, read: 120.0 MiB/s, write: 92.0 MiB/s
106: 2025-01-01 21:25:44 INFO:  39% (17.3 GiB of 44.1 GiB) in 1m 46s, read: 80.8 MiB/s, write: 72.0 MiB/s
106: 2025-01-01 21:25:47 INFO:  40% (17.8 GiB of 44.1 GiB) in 1m 49s, read: 166.7 MiB/s, write: 136.0 MiB/s
106: 2025-01-01 21:25:50 INFO:  41% (18.4 GiB of 44.1 GiB) in 1m 52s, read: 228.0 MiB/s, write: 145.3 MiB/s
106: 2025-01-01 21:25:53 INFO:  42% (18.9 GiB of 44.1 GiB) in 1m 55s, read: 181.3 MiB/s, write: 178.7 MiB/s
106: 2025-01-01 21:25:56 INFO:  44% (19.5 GiB of 44.1 GiB) in 1m 58s, read: 194.7 MiB/s, write: 194.7 MiB/s
106: 2025-01-01 21:25:59 INFO:  45% (20.1 GiB of 44.1 GiB) in 2m 1s, read: 213.3 MiB/s, write: 189.3 MiB/s
106: 2025-01-01 21:26:02 INFO:  47% (20.8 GiB of 44.1 GiB) in 2m 4s, read: 216.0 MiB/s, write: 209.3 MiB/s
106: 2025-01-01 21:26:05 INFO:  48% (21.3 GiB of 44.1 GiB) in 2m 7s, read: 188.0 MiB/s, write: 166.7 MiB/s
106: 2025-01-01 21:26:08 INFO:  49% (21.9 GiB of 44.1 GiB) in 2m 10s, read: 204.0 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:26:11 INFO:  50% (22.5 GiB of 44.1 GiB) in 2m 13s, read: 184.0 MiB/s, write: 165.3 MiB/s
106: 2025-01-01 21:26:14 INFO:  52% (23.0 GiB of 44.1 GiB) in 2m 16s, read: 198.7 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:26:17 INFO:  53% (23.6 GiB of 44.1 GiB) in 2m 19s, read: 192.0 MiB/s, write: 169.3 MiB/s
106: 2025-01-01 21:26:20 INFO:  54% (24.2 GiB of 44.1 GiB) in 2m 22s, read: 209.3 MiB/s, write: 144.0 MiB/s
106: 2025-01-01 21:26:23 INFO:  56% (24.8 GiB of 44.1 GiB) in 2m 25s, read: 185.3 MiB/s, write: 153.3 MiB/s
106: 2025-01-01 21:26:26 INFO:  57% (25.3 GiB of 44.1 GiB) in 2m 28s, read: 166.7 MiB/s, write: 160.0 MiB/s
106: 2025-01-01 21:26:29 INFO:  58% (25.8 GiB of 44.1 GiB) in 2m 31s, read: 172.0 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:26:32 INFO:  59% (26.3 GiB of 44.1 GiB) in 2m 34s, read: 197.3 MiB/s, write: 166.7 MiB/s
106: 2025-01-01 21:26:35 INFO:  60% (26.9 GiB of 44.1 GiB) in 2m 37s, read: 198.7 MiB/s, write: 172.0 MiB/s
106: 2025-01-01 21:26:38 INFO:  62% (27.5 GiB of 44.1 GiB) in 2m 40s, read: 201.3 MiB/s, write: 189.3 MiB/s
106: 2025-01-01 21:26:41 INFO:  63% (28.0 GiB of 44.1 GiB) in 2m 43s, read: 182.7 MiB/s, write: 176.0 MiB/s
106: 2025-01-01 21:26:44 INFO:  64% (28.6 GiB of 44.1 GiB) in 2m 46s, read: 189.3 MiB/s, write: 165.3 MiB/s
106: 2025-01-01 21:26:47 INFO:  66% (29.1 GiB of 44.1 GiB) in 2m 49s, read: 186.7 MiB/s, write: 154.7 MiB/s
106: 2025-01-01 21:26:50 INFO:  67% (29.7 GiB of 44.1 GiB) in 2m 52s, read: 188.0 MiB/s, write: 153.3 MiB/s
106: 2025-01-01 21:26:53 INFO:  68% (30.2 GiB of 44.1 GiB) in 2m 55s, read: 181.3 MiB/s, write: 138.7 MiB/s
106: 2025-01-01 21:26:56 INFO:  69% (30.8 GiB of 44.1 GiB) in 2m 58s, read: 178.7 MiB/s, write: 148.0 MiB/s
106: 2025-01-01 21:26:59 INFO:  70% (31.2 GiB of 44.1 GiB) in 3m 1s, read: 152.0 MiB/s, write: 150.7 MiB/s
106: 2025-01-01 21:27:02 INFO:  71% (31.7 GiB of 44.1 GiB) in 3m 4s, read: 186.7 MiB/s, write: 170.7 MiB/s
106: 2025-01-01 21:27:05 INFO:  73% (32.3 GiB of 44.1 GiB) in 3m 7s, read: 194.7 MiB/s, write: 149.3 MiB/s
106: 2025-01-01 21:27:08 INFO:  74% (32.9 GiB of 44.1 GiB) in 3m 10s, read: 201.3 MiB/s, write: 88.0 MiB/s
106: 2025-01-01 21:27:11 INFO:  76% (33.6 GiB of 44.1 GiB) in 3m 13s, read: 249.3 MiB/s, write: 102.7 MiB/s
106: 2025-01-01 21:27:14 INFO:  77% (34.2 GiB of 44.1 GiB) in 3m 16s, read: 201.3 MiB/s, write: 146.7 MiB/s
106: 2025-01-01 21:27:17 INFO:  78% (34.8 GiB of 44.1 GiB) in 3m 19s, read: 185.3 MiB/s, write: 168.0 MiB/s
106: 2025-01-01 21:27:20 INFO:  80% (35.5 GiB of 44.1 GiB) in 3m 22s, read: 252.0 MiB/s, write: 94.7 MiB/s
106: 2025-01-01 21:27:23 INFO:  81% (36.1 GiB of 44.1 GiB) in 3m 25s, read: 196.0 MiB/s, write: 166.7 MiB/s
106: 2025-01-01 21:27:26 INFO:  82% (36.6 GiB of 44.1 GiB) in 3m 28s, read: 186.7 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:27:29 INFO:  84% (37.2 GiB of 44.1 GiB) in 3m 31s, read: 204.0 MiB/s, write: 156.0 MiB/s
106: 2025-01-01 21:27:32 INFO:  85% (37.8 GiB of 44.1 GiB) in 3m 34s, read: 193.3 MiB/s, write: 156.0 MiB/s
106: 2025-01-01 21:27:35 INFO:  86% (38.4 GiB of 44.1 GiB) in 3m 37s, read: 205.3 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:27:38 INFO:  88% (39.0 GiB of 44.1 GiB) in 3m 40s, read: 194.7 MiB/s, write: 149.3 MiB/s
106: 2025-01-01 21:27:41 INFO:  89% (39.5 GiB of 44.1 GiB) in 3m 43s, read: 190.7 MiB/s, write: 165.3 MiB/s
106: 2025-01-01 21:27:44 INFO:  90% (40.1 GiB of 44.1 GiB) in 3m 46s, read: 208.0 MiB/s, write: 168.0 MiB/s
106: 2025-01-01 21:27:47 INFO:  92% (40.7 GiB of 44.1 GiB) in 3m 49s, read: 208.0 MiB/s, write: 142.7 MiB/s
106: 2025-01-01 21:27:50 INFO:  93% (41.3 GiB of 44.1 GiB) in 3m 52s, read: 197.3 MiB/s, write: 146.7 MiB/s
106: 2025-01-01 21:27:53 INFO:  94% (41.9 GiB of 44.1 GiB) in 3m 55s, read: 193.3 MiB/s, write: 156.0 MiB/s
106: 2025-01-01 21:27:56 INFO:  96% (42.5 GiB of 44.1 GiB) in 3m 58s, read: 197.3 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:27:59 INFO:  97% (43.0 GiB of 44.1 GiB) in 4m 1s, read: 189.3 MiB/s, write: 170.7 MiB/s
106: 2025-01-01 21:28:02 INFO:  98% (43.6 GiB of 44.1 GiB) in 4m 4s, read: 205.3 MiB/s, write: 134.7 MiB/s
106: 2025-01-01 21:28:05 INFO: 100% (44.1 GiB of 44.1 GiB) in 4m 7s, read: 178.7 MiB/s, write: 162.7 MiB/s
106: 2025-01-01 21:28:29 INFO: backup was done incrementally, reused 392.66 GiB (91%)
106: 2025-01-01 21:28:29 INFO: transferred 44.14 GiB in 271 seconds (166.8 MiB/s)
106: 2025-01-01 21:28:29 INFO: adding notes to backup
106: 2025-01-01 21:28:30 INFO: Finished Backup of VM 106 (00:04:34)

What am I doing wrong ? What can I do to avoid the guest OS to freeze for minutes during backups ?

Additional information: all these VMs where born as ESXi 6.5 VMs, they've been running on PVE for about two months.


VM106 config:
1735767605334.png

Please feel free to ask any kind of question; any help is really appreciated!

Best regards to you all,
Giorgio
 
Last edited:
a little update: i believe it's some sort of i/o problem, because it happened again and the guest "top" was showing like:
- load average: 320 (and increasing)
- %cpu about 4%
I had to stop the backup because a downtime of the guest machine was not acceptable, and I haven't been able to dig deeper.
 
You have two problems. Aborted backups and stunned VMs.
I don't know about the aborts. You've likely got storage contention issues.

There's a feature to address the stun you are experiencing in the VMs.
It's called fleecing. They could have called it caching, but i guess they wanted to differentiate it somehow.

Go to the last tab of your backup.
Turn it on.
Very important: Select your fastest storage for this fleecing cache thing.
1736031256864.png
 
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tcabernoch said:
You have two problems. Aborted backups and stunned VMs.
I don't know about the aborts. You've likely got storage contention issues.

There's a feature to address the stun you are experiencing in the VMs.
It's called fleecing. They could have called it caching, but i guess they wanted to differentiate it somehow.

Go to the last tab of your backup.
Turn it on.
Very important: Select your fastest storage for this fleecing cache thing.
View attachment 80196
Click to expand...
WOW, this sounds super nice! Many thanks!
I didn't know about fleecing (and yes, it looks like caching to mee, too!); I read the paragraph about fleecing in the PBS manual and it perfectly describes what was happenning to me: it makes perfectly sense that my issue was caused by the random, unlucky combination of high disk writes and temporary low network performace between PVE and PBS (usually my backups are transferred at 150+ MB/s... usually!).
I'm surpsised that I've googled a lot and asked chatGPT several times before posting here, and nothing led me to fleecing. RTFM truly applies here, shame on me :oops:
 
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Meh. The PBS product is in version 3.x, and you'd think it would have some sort of caching already, but fleecing was added just a few months ago. There are a lot of pros who have no idea what it is. That's gonna address the stun issues ... but with the stun out of the way, you are gonna probably uncover whatever was causing the aborts as well. Good luck.
 
Ah, it makes more sense to me now, since I'm not the kind of guy who surrenders at the very first issue and falls back asking into the forum without deep searching online.
Actually, I hadn't had any issues with aborting backups: I just had to manually abort them via web GUI when the guest OSes were freezing.
Thank you again guy, you made my day. I owe you a beer, next time you'll come to Italy!
 
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