problems with gmirror on ggate over slow link

[Oliver Brandmueller]

Hi,

On Fri, Oct 23, 2009 at 11:56:24AM +0100, Pete French wrote:
> If the remote diisc is actually on a very close machine - e.g. a server
> plugged into the same ether net - then all works fine. If I make
> the remote disc somewhere actually substantially further away on the
> nbetwork, however, then when I attach the disc it starts to rebuild the
> mirror but then fails a fraction of a second later thus:
> 
> GEOM_MIRROR: Device mysql0: rebuilding provider ggate1a.
> GEOM_MIRROR: Synchronization request failed (error=5). ggate1a[WRITE(offset=1310720, length=131072)]
> GEOM_MIRROR: Device mysql0: provider ggate1a disconnected.
> GEOM_MIRROR: Device mysql0: rebuilding provider ggate1a stopped.
> 
> The interesting this is that the problem is only with gmirror, not with
> the underlying ggate disc which remains attached and accessible. I tested
> this by adding a second partition (ggate1b in the example above) and
> mounting a UFS filesystem on that.

Just a wild guess, have you tried to set kern.geom.mirror.timeout to a 
higher value?

- Olli

-- 
| Oliver Brandmueller          http://sysadm.in/         ob at sysadm.in |
|                        Ich bin das Internet. Sowahr ich Gott helfe. |