comfi wrote at about 15:57:45 -0700 on Monday, April 18, 2011:

 > I recently fired up BackupPC as a replacement for our convoluted
 > and outdated Amanda setup to backup an environment of about 200
 > servers. So far, I have BackupPC version 3.1.0 installed on an
 > Ubuntu 10.04 system. I'm using this to back up a grand total of
 > three systems: 2 other Ubuntu machines and the
 > localhost. Everything was running fine and dandy when I had all
 > backup data going to local disk. However, I'm having massive
 > performance issues after switching to an NFS mount for my backup
 > data.
 > 
 > Per the instructions, I mounted /var/lib/backuppc to my NFS share. I'm using 
 > the following options:
 > 
 > nfs.server.ourstuff.com:/backup/backuppc      /var/lib/backuppc       nfs    
 >  nfsvers=3,tcp,hard,intr,rsize=32768,wsize=32768,bg
 > 
 > These options were recommended to me by Data Domain, the manufacturer of the 
 > storage device containing my NFS mount. This device only supports CIFS and 
 > NFS, sadly. I have also tried with larger and smaller rsize/wsize, and 
 > noatime. 
 > 

I found using 'async' (rather than the default 'sync') dramatically
sped up NFS performance.

 > If I can't resolve this problem, we'll have to abandon
 > BackupPC. That breaks my heart, because I really like what I see so
 > far.

I don't understand your logic here... NFS is broken (for you) but your
solution is to abandon BackupPC????

The issue clearly is NFS which you either need to fix or use an
alternative. BackupPC assuredly is working just fine.

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