[pve-devel] Speed up PVE Backup

[Stefan Priebe - Profihost AG]

Am 16.02.2016 um 15:50 schrieb Dmitry Petuhov:
> 16.02.2016 13:20, Dietmar Maurer wrote:
>>> Storage Backend is ceph using 2x 10Gbit/s and i'm able to read from it
>>> with 500-1500MB/s. See below for an example.
>> The backup process reads 64KB blocks, and it seems this slows down ceph.
>> This is a known behavior, but I found no solution to speed it up.
> Just done script to speedup my backups from ceph. It's simply does
> (actually little more):
> rbd snap create $SNAP
> rbd export $SNAP $DUMPDIR/$POOL-$VOLUME-$DATE.raw
> rbd snap rm $SNAP
> for every image in selected pools.
> 
> When exporting to file, it's faster than my temporary HDD can write
> (about 120MB/s). But exporting to STDOUT ('-' instead of filename, with
> compression or without it) noticeably decreases speed to qemu's levels
> (20-30MB/s). That's little strange.
> 
> This method is incompatible with PVE's backup-restore tools, but good
> enough for manual disaster recovery from CLI.

right - that'S working for me too but just at night and not when a
single user wants RIGHT now a backup incl. config.

> 
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