Hi,
I would suggest a different a test approach, instead of using dd you should try
iozone. dd use of IO is sequencial so it's not a typical use of
storage/disk/etc, it will show you only the max throughput of the device not
the daily charge on the storage.
Apart from that you may use udp for the data transfer, it won't be as safe but
to be sincere I don't see a problem there depending on the network confidence
and isolation. There are other mount options as noatime (both on the storage as
in the server) that might improve performance.
On the networking level check if the storage, switches and network card
support jumbo frames and if so use them.
Cheers,
Pedro
On Tuesday 19 April 2011 15:43:35 Timothy J Massey wrote:
> comfi <backuppc-forum AT backupcentral DOT com> wrote on 04/18/2011 06:57:45
> PM:
>
> > 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 outdated Amanda setup to backup an environment of about 200 servers.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
>
> I agree strongly with Adam. Most likely, your problem is not a BackupPC
> issue, but an NFS issue. To determine this, do some performance testing
> with dd. If you see the same issue there (and I think you will), you can
> then start to debug your NFS issues.
>
> I also agree strongly with Adam: NFS and performance do *not* mix. I
> have put much work into making NFS work with high performance for use as a
> VMware datastore. All of my research led me to believe that it's just not
> possible without using very high-end hardware with large battery-backed
> cache. You might find my research helpful--at the very least, it will
> show you how to perform the testing using dd.
>
> http://communities.vmware.com/thread/263165?start=0&tstart=0
>
>
> Having said all of the above, the results you are seeing (*minutes* for a
> webpage to display) do not seem like expected low-end performance, they
> sound like something is *broken*. However, it is *very* unlikly that it's
> BackupPC that is broken, but rather something else at a lower layer.
> Hopefully, a simple test with dd will help you to reproduce it simply and
> easily, and let you test things more quickly.
>
> Timothy J. Massey
>
>
> Out of the Box Solutions, Inc.
> Creative IT Solutions Made Simple!
> http://www.OutOfTheBoxSolutions.com
> tmassey AT obscorp DOT com
>
> 22108 Harper Ave.
> St. Clair Shores, MI 48080
> Office: (800)750-4OBS (4627)
> Cell: (586)945-8796
>
--
----------------------------------------------------------------------------------------------------------
Pedro M. S. Oliveira
IT Consultant
Email: pmsoliveira AT gmail DOT com
URL: http://www.linux-geex.com
Cellular: +351 96 5867227
----------------------------------------------------------------------------------------------------------
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