[pve-devel] Speed up PVE Backup

[Eduard Ahmatgareev]

If you have restrictions cgroups on your vm, this vm backups with this
restrictions.


2016-02-16 12:02 GMT+02:00 Martin Waschbüsch <service at waschbuesch.it>:

>
> > Am 16.02.2016 um 10:32 schrieb Stefan Priebe - Profihost AG <
> s.priebe at profihost.ag>:
> >
> > Am 16.02.2016 um 09:57 schrieb Martin Waschbüsch:
> >> Hi Stefan,
> >
> >>> This is PVE 3.4 running Qemu 2.4
> >>
> >> To me this looks like the compression is the limiting factor? What
> speed do you get for this NFS mount when just copying an existing file?
> >
> > Which compression? There is only FS compression on the target side
> > involed. I'm not using any compression on the source side.
>
> Sorry, reading the 26MB/s I just assumed it sort of HAD to be compressed
> for it to be so slow...
> What kind of storage backend do you use for the images on the source side?
> Can you dd a disk image from that backend to the nfs mount with good speed?
>
> > Writing to the NFS is very fast:
> > # du -sh /root/testfile
> > 640M    /root/testfile
> >
> > # dd if=/root/testfile of=/mnt/pve/vmbackup/dump/testfile bs=4M
> oflag=direct
> > 159+1 records in
> > 159+1 records out
> > 671088620 bytes (671 MB) copied, 0,855779 s, 784 MB/s
>
> That looks like there should be ample bandwidth. ;-)
>
>
> Martin
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