gvinum performance issues

[Marco Haddad]

Hi, everybody!

Could at least someone please confirm that I'm not alone here?

Thanks!
Marco Haddad

On Sun, Jul 18, 2010 at 6:41 PM, Marco Haddad <freebsd-lists at ideo.com.br>wrote:

> Hello,
>
> I've seen somewhere a thread about this topic, but I can't find it here,
> where I think it ought to be.
> So, let me describe what is going on: I had this Core2 Quad running as
> Internet gateway, web server and file server, doing fine with FreeBSD 7.2
> for a long time. The problem came with the upgrade to version 8.0.
>
> It is composed of two gmirror volumes, each build up from a pair of 500GB
> disks. They are not the problem. Because of the nature of this server role,
> a long history of backups is necessary, and for that task there was a single
> 1.5TB disk, which got filled up after some time.
>
> Then I decided to get two more 1.5TB disks and use gvinum to build a raid5
> volume for the backup. That was done with success. The backup operation that
> used to take four hours to complete, now was taking 6 hours, what was ok for
> an over night backup.
>
> Then I decided to upgrade to version 8.0, so I could grow the volume just
> adding more disks, without losing its content. The upgrade went well with no
> problems at all, but the backup was already running for three days when I
> realized that something was wrong. The transfer rate was around 200KB/s, a
> fraction of what it was with version 7.2.
>
> After trying all possible solutions found, including rebuilding parity,
> destroying the volume and recreating under version 8.0, I decided the just
> concat the three disks and let the backup roll, while I seek for help.
>
> I read somewhere Ulf telling that he had received a number of similar
> complaints, but there was no solution on that thread yet.
>
> So if someone here had this problem solved, please enlighten me.
>
> Thanks in advance,
> Marco Haddad
>