right but with no knowledge whatsoever about its content.
On Sat, Nov 21, 2009 at 04:09:55PM -0701, Jeff Ross wrote:
> On Sat, 21 Nov 2009, Ted Unangst wrote:
>
> > On Fri, Nov 20, 2009 at 2:08 PM, Jeff Ross <jr...@openvistas.net> wrote:
> >> I failed a drive (*NOT* with a nail gun, though, I just removed it ;-) and
> >> bioctl correctly showed the drive as failed and the raid running as
> >> degraded. I re-inserted the same drive but I was unable to find any
> magic
> >> bioctl -R that would kick off a rebuild.
> >>
> >> I shutdown that server, removed the failed drive and inserted it into
> >> another identical SuperMicro. System booted, noted an unclean shutdown,
> ran
> >> fsck and was at login in short order.
> >>
> >> So, just for fun I shutdown the second server, took its drive and
> >> reinstalled in the second slot of the first again and fired it up. As the
> >> system booted the second drive's light lit solid on so I suspected a
> behind
> >> the scenes rebuild was going on. When I got logged in bioctl -v mpi0
> shows
> >> both drives online, and the raid status is Rebuild.
> >
> > I have no idea what magic your raid controller has, but unless it
> > understands filesystems, this is really asking for trouble. You have
> > two similar but slightly different filesystem images. You are going
> > to "merge" them?
>
> No, I don't think that's the way it is supposed to work.
>
> >
> > I assume/hope the the raid card just picked one drive as the winner
> > and is going to wipe the other, because that's the only way this could
> > work.
>
> Maybe I've always misunderstood hardware raid controllers but I thought
> that's the way they are supposed to work, especially with raid1. One
> drive in the set fails, the controller notes that, and if a hot spare is
> available it begins rebuilding the array using the hot spare, replacing
> the failed drive.
>
> In my scenario, in a 1U server with 2 enclosures I do not have a hot spare
> online but I still have a good drive and a failed drive. Replacing the failed
> drive, even with the exact same hard disk, has to result in copying the
> good drive to the new drive, right?
>
> Jeff
