times for backup

[ciro]

Good morning
I perform a daily backup with proxmox 6.4-6 on a nas in nfs, my vm runs on SAN FC; this morning I found that the backup times had an increase of about 15 minutes, normally I was able to do my backup about 1 hour but this morning it cost me about 15/20 minutes more:
earlier times:
INFO: backup is sparse: 1.13 GiB (0%) total zero data
INFO: transferred 200.00 GiB in 3066 seconds (66.8 MiB/s)
INFO: archive file size: 38.98GB
current times:
NFO: backup is sparse: 1.14 GiB (0%) total zero data
INFO: transferred 200.00 GiB in 2987 seconds (68.6 MiB/s)
INFO: archive file size: 39.07GB
The archive doesn't seem to have grown to justify 15 minutes of delay and it's the first time I've noticed this; therefore I was wondering what reason this can cause me and if there is an anomaly

 

[Moayad]

Hi,

I would check if you have a monitor at the backup time if there was a performance issue in the network or the NAS storage.

 

[dcsapak]

this seems to be the difference:

2023-02-14 04:45:03 INFO: issuing guest-agent 'fs-freeze' command
2023-02-14 04:50:39 INFO: issuing guest-agent 'fs-thaw' command

vs

2023-02-15 04:45:03 INFO: issuing guest-agent 'fs-freeze' command
2023-02-15 05:11:15 INFO: issuing guest-agent 'fs-thaw' command

the fs-freeze alone takes ~21 minutes longer

 

[ciro]

Hi,

I would check if you have a monitor at the backup time if there was a performance issue in the network or the NAS storage.

Hi, I investigated a bit about it but I couldn't figure out if tonight at the time of the backup there were anomalies on the NAS or on the network, currently everything seems to work correctly. If the attached logs reveal no other reason I will wait for the next backup thanks
PS
We have already subscribed to a commercial support see Terminal FlavioGioia spa
Hi,

 

[ciro]

this seems to be the difference:


vs


the fs-freeze alone takes ~21 minutes longer

and what could this depend on?

 

[dcsapak]

that depends on how your guest is configured, but normally fsfreeze will try freeze the filesystems in the vm so that the disk content is consistent, what it does exactly depends on the guest operating systems
(e.g i think it enables vss in windows and uses the FIFREEZE ioctl() on linux)

 

[ciro]

that depends on how your guest is configured, but normally fsfreeze will try freeze the filesystems in the vm so that the disk content is consistent, what it does exactly depends on the guest operating systems
(e.g i think it enables vss in windows and uses the FIFREEZE ioctl() on linux)

He practically kept it frozen for 20 minutes against 5 minutes the previous day and no one knows why, the vm
it's a linux machine. I'll see what happens tomorrow. Thank you