[PVE-User] backup : add pigz compressor

Alexandre DERUMIER aderumier at odiso.com
Fri Jul 10 06:51:21 CEST 2015


user from pve-user mailing report than using pigz (multithread gzip),
improve a lot speed of compression backup.

Maybe could we use add it ? (or maybe replace gzip ?)

----- Mail original -----
De: "Chidester, Bryce" <Bryce.Chidester at calyptix.com>
À: "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Jeudi 9 Juillet 2015 20:30:30
Objet: Re: [PVE-User] slow backup

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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