Unusable VMs/CTs during backup restoring

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chudak

Renowned Member
Proxmox Subscriber
May 11, 2019
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Hello

I run Proxmox on Intel I7 NUC 12 x Intel(R) Core(TM) i7-10710U CPU @ 1.10GHz (1 Socket) with 64 GB RAM
I noticed lately that when I restore VM/CT my other VMs/CTs become very slow, almost unusable, e.g. can't connect via VNC, commands hung via ssh session.

I wonder how to troubleshoot this and if anybody knows anything about this behavior?

TIA
 
1.10GHz is extremely slow nowadays, IIRC I was running a single-cpu 900MHz in the late 90s.

I would upgrade to a faster processor with more cores, and post details about your disks / backing storage (make/model/size) and configuration (raidz, mirrors, etc)
 
Kingneutron said:
1.10GHz is extremely slow nowadays, IIRC I was running a single-cpu 900MHz in the late 90s.

I would upgrade to a faster processor with more cores, and post details about your disks / backing storage (make/model/size) and configuration (raidz, mirrors, etc)
Click to expand...

I am not disagreeing
But I've used it for 5-7 VMs/CTs for a while and never had those issues.
In other words, I believe it's something that I see on v9.x
 
PVE 9 does seem to use more CPU during full backup/restore (local storage or NFS).
Check your CPU usage during the backup window, and compare it to regular usage.
I have noticed on my servers, during nightly full backups, CPU spikes leading to VM connection loss.
In my case, things go to normal after the backups are done.
You might have to change the backup schedule so as to minimize disruptions.

Intel NUC10I7FNH: this is exactly my Windows desktop.
It means you only have 6 cores (it's hyper-threaded), not 12. I am not surprised you have issues.
 
Last edited:
chudak said:
I7 NUC 12 x Intel(R) Core(TM) i7-10710U CPU @ 1.10GHz (1 Socket) with 64 GB RAM
Click to expand...
Do you possibly mean NUC 10 not 12. Intel NUCs were released according to the CPU generation. If you somehow have a newer 12th generation NUC (possibly a different vendor) but with an older 10th gen CPU, this may explain your experience.

The i7-10710U with a max turbo of 4.70 GHz @ 6C/12T is a perfectly capable CPU & coupled with 64GB in your system should be pretty robust, depending on what you are doing with it, of course.

In no way can this be compared to some PC CPU of the nineties.

Your bottleneck is almost for sure not CPU related, but more likely NW/storage. On one of those NUCs, if you have excessive USB connected storage/NW devices, you are going to overwhelm the bus chips etc. on that miniscule device. Temps & PD can also be a factor.

Good luck.
 
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