[PVE-User] slow backup

Chidester, Bryce Bryce.Chidester at calyptix.com
Thu Jul 9 20:30:30 CEST 2015

While this doesn't directly address the issue you're experiencing, it
may help slightly.
In my Proxmox deployments, I've replaced /bin/gzip with pigz (
http://zlib.net/pigz/ apt-get install pigz ; ln -sfb /usr/bin/pigz
/bin/gzip). pigz is a multi-threaded gzip, and it significantly
decreased our backup times by speeding up the compression. We saw
backup times drop to just 10-50% of what they took running gzip. These
big, beefy virtualisation servers have all these CPUs+cores, so why
limit gzip to just one?


Bryce Chidester
Director of Systems Engineering
Calyptix Security | Simply Powerful Network Security.


On Sun, 2015-07-05 at 21:19 +0200, Tonči Stipičević wrote:
> Hello to all
> I'm using 4xIntelAtom CPU 2558 @2,4GHz  on the host 
> a backup storages are (1G) freenas nfs and local sata disk
> So classic backup (vzdump) of 32G image takes about 1h ... the same 
> result to  the nfs storage and to local sata disk
> I tried changing bwlimit in vzdump.conf   the result is allways the 
> same slow
> But Clone VM takes less then 10 min 
> manual lzop backup of this image (nfs storage or sata disk) takes 
> less than 10' too   ... tar runs  same fast
> So we cannot say tha CPU is not capable of doing archiving with 
> commpression 
> Why is backup so slow and what can I do to optimize it?
> thank you very much in advance and 
> BR
> Tonci 
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> pve-user at pve.proxmox.com
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