[SOLVED] Huge number in size column

R

Rufus Ebonhawk

Well-Known Member
Proxmox Subscriber
Aug 7, 2017
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We test proxmox-backup-client on some VM (Rocky 8, Debian 10/11) and experience a strange behaviour in the Size column of the GUI.

All VM should have around 5GiB size but some have ~322GiB.

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In the respective snapshot folder the pxar-file of the VM with 322 GiB is ~1.7Mib and the pxar-file of the VM with ~5 GiB is 62K.

proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/vm-backup") failed - could not parse 'objset-objset-0x305c' stat file

Restore of single files with catalog shell works for all.

In the syslog we find this messages during backups:

Code: 
Mar 04 14:00:42 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/vm-backup") failed - could not parse 'objset-objset-0x305c' stat file
Mar 04 14:00:52 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/fileserver") failed - could not parse 'objset-objset-0x31ec' stat file
Mar 04 14:00:52 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/vm-backup") failed - could not parse 'objset-objset-0x305c' stat file
Mar 04 14:01:02 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/vm-backup") failed - could not parse 'objset-objset-0x305c' stat file
Mar 04 14:01:02 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/fileserver") failed - could not parse 'objset-objset-0x31ec' stat file

Ist this only a warning or somethin serious?

For each PBS Datastore we have a dedicate ZFS dataset.

Zpool are clean, no errors.
 
This is the output of the garbage collection. At the end:

Code: 
2022-03-04T14:55:43+01:00: Original data usage: 972.506 GiB
2022-03-04T14:55:43+01:00: On-Disk usage: 7.048 GiB (0.72%)
2022-03-04T14:55:43+01:00: On-Disk chunks: 5710
2022-03-04T14:55:43+01:00: Deduplication factor: 137.98
2022-03-04T14:55:43+01:00: Average chunk size: 1.264 MiB

The four machines which are currently in the datastore are definitely not 972 GiB big. They are all 8GiG Machines... Something is really crooked here!

Code: 
ProxmoxBackup Server 2.1-5
()
2022-03-04T14:54:28+01:00: starting garbage collection on store vm-backup
2022-03-04T14:54:28+01:00: Start GC phase1 (mark used chunks)
2022-03-04T14:54:28+01:00: marked 12% (1 of 8 index files)
2022-03-04T14:54:52+01:00: marked 25% (2 of 8 index files)
2022-03-04T14:55:10+01:00: marked 37% (3 of 8 index files)
2022-03-04T14:55:10+01:00: marked 50% (4 of 8 index files)
2022-03-04T14:55:10+01:00: marked 62% (5 of 8 index files)
2022-03-04T14:55:22+01:00: marked 75% (6 of 8 index files)
2022-03-04T14:55:22+01:00: marked 87% (7 of 8 index files)
2022-03-04T14:55:23+01:00: marked 100% (8 of 8 index files)
2022-03-04T14:55:23+01:00: Start GC phase2 (sweep unused chunks)
2022-03-04T14:55:25+01:00: processed 1% (57 chunks)
2022-03-04T14:55:25+01:00: processed 2% (108 chunks)
2022-03-04T14:55:25+01:00: processed 3% (155 chunks)
[...]
2022-03-04T14:55:42+01:00: processed 98% (5700 chunks)
2022-03-04T14:55:42+01:00: processed 99% (5761 chunks)
2022-03-04T14:55:43+01:00: Removed garbage: 0 B
2022-03-04T14:55:43+01:00: Removed chunks: 0
2022-03-04T14:55:43+01:00: Pending removals: 201.701 MiB (in 113 chunks)
2022-03-04T14:55:43+01:00: Original data usage: 972.506 GiB
2022-03-04T14:55:43+01:00: On-Disk usage: 7.048 GiB (0.72%)
2022-03-04T14:55:43+01:00: On-Disk chunks: 5710
2022-03-04T14:55:43+01:00: Deduplication factor: 137.98
2022-03-04T14:55:43+01:00: Average chunk size: 1.264 MiB
2022-03-04T14:55:43+01:00: TASK OK
 
the big files are probably sparse files (which appear as their non-sparse size in the backup)
nothing to worry though, since on restore we restore them sparsely again
e.g. some users reported that for /var/log/lastlog
notice the difference in size between those two commands:
Code: 
ls -lh /var/log/lastlog
du -h /var/log/lastlog

Rufus Ebonhawk said:
Mar 04 14:00:42 io proxmox-backup-proxy[2706849]: zfs_dataset_stats("tank/vm-backup") failed - could not parse 'objset-objset-0x305c' stat file
Click to expand...
these should not happen though... (but are also not fatal errors, this means that we could not parse/find the correct file in proc to parse the dataset statistics for the zfs dataset)

could you post the output of
Code: 
ls -lh /proc/spl/kstat/zfs/tank
cat /proc/spl/kstat/zfs/tank/objset-0x305c
?
 
Code: 
root@io:~ # ls -lh /proc/spl/kstat/zfs/tank
total 0
-rw-r--r-- 1 root root 0 Mar  4 16:02 dmu_tx_assign
-rw-r--r-- 1 root root 0 Mar  4 16:02 iostats
-rw-r--r-- 1 root root 0 Mar  4 16:02 multihost
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x1a8b
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x202
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2e66
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2e9a
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2f4f
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2f8a
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x30de
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x36
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x4238
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6cd3
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6d58
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6d70
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6dd0
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x78
-rw------- 1 root root 0 Mar  4 16:02 reads
-rw-r--r-- 1 root root 0 Mar  4 16:02 state
-rw-r--r-- 1 root root 0 Mar  4 16:02 txgs

root@io:~ # cat /proc/spl/kstat/zfs/tank/objset-0x305c
cat: /proc/spl/kstat/zfs/tank/objset-0x305c: No such file or directory
 
dcsapak said:
the big files are probably sparse files (which appear as their non-sparse size in the backup)
nothing to worry though, since on restore we restore them sparsely again
e.g. some users reported that for /var/log/lastlog
notice the difference in size between those two commands:
Code: 
ls -lh /var/log/lastlog
du -h /var/log/lastlog
Click to expand...

Cool, this is precisely the case. Thx.
 
Rufus Ebonhawk said:
Code: 
root@io:~ # ls -lh /proc/spl/kstat/zfs/tank
total 0
-rw-r--r-- 1 root root 0 Mar  4 16:02 dmu_tx_assign
-rw-r--r-- 1 root root 0 Mar  4 16:02 iostats
-rw-r--r-- 1 root root 0 Mar  4 16:02 multihost
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x1a8b
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x202
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2e66
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2e9a
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2f4f
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x2f8a
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x30de
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x36
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x4238
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6cd3
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6d58
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6d70
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x6dd0
-rw-r--r-- 1 root root 0 Mar  4 16:02 objset-0x78
-rw------- 1 root root 0 Mar  4 16:02 reads
-rw-r--r-- 1 root root 0 Mar  4 16:02 state
-rw-r--r-- 1 root root 0 Mar  4 16:02 txgs

root@io:~ # cat /proc/spl/kstat/zfs/tank/objset-0x305c
cat: /proc/spl/kstat/zfs/tank/objset-0x305c: No such file or directory
Click to expand...
We managed about around destroyed and created again zfs datasets with the same name... And removed and created them agaign as a datastore in PBS. Maybe we have to restart proxmox-backup-proxy to inform PBS about this changes ... :-? Currentlythere is a long running backup job active...
 
Rufus Ebonhawk said:
We managed about around destroyed and created again zfs datasets with the same name... And removed and created them agaign as a datastore in PBS. Maybe we have to restart proxmox-backup-proxy to inform PBS about this changes ... :-? Currentlythere is a long running backup job active...
Click to expand...
This restart seemed to have solved the problem. No zfs error messages anymore.
 
Rufus Ebonhawk said:
We managed about around destroyed and created again zfs datasets with the same name... And removed and created them agaign as a datastore in PBS. Maybe we have to restart proxmox-backup-proxy to inform PBS about this changes ... :-? Currentlythere is a long running backup job active...
Click to expand...
yes that case could lead to the seen behaviour, workaround is to reload (no need to restart) the proxmox-backup-proxy, it will find the correct file then
nonetheless i'll send a patch for this behaviour so that a reload/restart should not be necessary anymore
 
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