Strange ZFS behaviour when a drive fail.

[Ståle Kristoffersen]

On 2008-03-26 at 08:10, Jeremy Chadwick wrote:
> On Wed, Mar 26, 2008 at 03:23:46PM +0100, Ståle Kristoffersen wrote:
> > when I then ran zpool status I got:
> >  scrub: resilver completed with 0 errors on Wed Mar 26 15:15:50 2008
> > 
> > Why did it start to resilver onto "nothing", and why can't I replace it with mfid8 (even with -f)?
> 
> I believe this problem was stated back in January (see the 2nd half of
> the post), although Joe's problem showed an incremented CHKSUM, not an
> actual drive in FAULTED mode:
> 
> http://lists.freebsd.org/pipermail/freebsd-fs/2008-January/004241.html
> 
> Either way, the situation sounds very familiar (failure + reboot
> resulting in the pool silvering for strange reasons).

Yeah, it looks like it could be the same thing.
However, I fixed the last problem by writing over the last part of the
drive with dd:
dd if=/dev/zero of=/dev/mfid8 bs=1M seek=953300
I could then replace it and it started to resilver.

Why didn't this happen automatically when I ran zpool replace -f?
-- 
Ståle Kristoffersen