Re: [BackupPC-users] vmware/virtuabox/etc.?
2009-04-11 22:02:05
Les Mikesell wrote at about 07:45:50 -0500 on Thursday, April 9, 2009:
> Thomas Karcher wrote:
> > Hi Ski,
> >
> >>> Performance is of course not really great but surprisingly good. I
> >>> evaluated (very shortly) against mounting via NFS, and NFS just sucks
> >>> with backuppc.
> >> I think it depends on the NFS server you are using. I have over 1500
> >> clients backing up via 7 backuppc servers attached via nfs to a high
> >> performance Exastore NAS device. Works great.
> >
> > Ah, yes, that's possible, I have a much "cheaper" environment - and also
> > a setup smaller by magnitudes. I had the impression that many very small
> > disk accesses (as backuppc does when checking for newer file version
> > etc.) is already a bad disk usage pattern by itself. And NFS didn't
> > handle it better either ...
> >
> > Anyway, nice to know that a specialized NAS device could help there.
>
> Usually you are waiting on disk head motion - and if you run nfs in sync
> mode you wait for completion on every write. The things that can help
> are lots of physical disks in the volume (better odds for the head to
> already be near the right place) and running async with lots of
> buffering. Expensive devices might even have some battery-backed or
> nonvolatile buffering.
Just as an FYI, running in 'async' mode significantly speeds up NFS
for exactly the reason alluded to above.
>
> --
> Les Mikesell
> lesmikesell AT gmail DOT com
>
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