On Tue, Sep 02, 2008 at 11:34:44AM +1000, Stephen Vaughan wrote: > Hmm yeah I've a bit of a play with the nfs client side, the nfs server is > purely web based, so it's limited to what I can play with. > > What about the network side of things, with data coming in and back out on > the same interface?
I's say: Tune NFS performance first without backuppc - you probably need to tune NFS anyway. Then look how it works. Separating the interfaces might be a good idea, but on the other hand, the access should be rather serial: - server receives something via rsync protocol - then reads or writes some data via NFS - then sends response to client Situation is a bit different with multiple concurrent backups. If it's cheap to add another NIC, just do it - but it might not solve your NFS performance issues. > > > We have backuppc running on a server, with an NFS mount to a NAS device. > > > Everything is gigabit, there is only 1 nic in the backuppc server > > > connected to the switch, so traffic comes in from the servers we're > > > backing up and then straight back out the same nic to the NFS mount. > > > > > > I'm finding significant performance drops in backing up data to the NAS > > > via the backuppc server. When we run backups to the local storage in the > > > server, the backups run much faster and the network usage is almost > > > triple. I know NFS won't be as fast as the local storage, but is it > > > possible the network card is conngested? > > > > > > Would it be better to plug in a second nic to the backuppc server and > > > allow traffic to come in via nic1 and out to the nfs mount via nic2? > > > > You probably need to consider that performance of NFS is never likely to > > be as fast compared to local disk (unless your NFS Server has slow disks > > and your local disks are fast). > > > > However, to optimise the performance you are getting now, you need to > > start by focussing on improving your NFS performance, so ignore > > backuppc, and run various tests, follow the available NFS performance > > optimising howto's from google, and then throw backuppc back into the > > mix..... > > > > I don't recall the details, but I was having a number of performance > > issues with my NFS server, and after fixing the NFS mount options, and > > the NFS export options on the server, along with tuning a number of > > variables on the NFS server (under /proc/something) I managed to resolve > > most of my problems. (The final problem (which was probably the first > > problem) was that the NFS client had faulty RAM).... HTH, Tino. -- "What we nourish flourishes." - "Was wir nähren erblüht." www.craniosacralzentrum.de www.forteego.de ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
