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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