I recently fired up BackupPC as a replacement for our convoluted and outdated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.
Everything appears to be working correctly. I can backup and restore with no
errors. However, the performance is worse than atrocious and I can't believe
everything is working correctly. For example, when I'm in the web GUI, clicking
on Host Summary when on localdisk took less than 1 second. Now, on NFS,
clicking on Host SUmmary takes 4 minutes and 31 seconds to come up, and that's
with only three hosts and a grand total of about 400MB of backup data. That
can't be right, even with NFS's slower performance. Everything on the server
indicates that resources are fine. The CPUs are sleeping, RAM is way below half
occupied, loads of free local disk...
I tried making an NFS mont on a different storage device and got the same
results. This other storage device, which I can't use for backups, is capable
of doing iSCSI, so I tried mounting the backup volume that way and everything
was fantastic. Performed like local disk (less than a second to pull up the
host summary page). So basically, it's definitely the fact that I'm mounting
via NFS. 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.
Any suggestions? Thank in advance!
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