Date: Tue, 13 Dec 2005 08:16:37 -0500 From: Mark Bucciarelli <mark@gaiahost.coop> To: freebsd-geom@freebsd.org Subject: How to recover a gmirror from a disaster Message-ID: <20051213131637.GC2188@rabbit>
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The disaster:
1. gmirror setup (full disk mirror, da0 + da1)
2. disk head crash into platter on da1
3. reboot
4. mirror starts to sync, hits bad spot on da1, halts
5. restart (can work for a while b/f bad spot hit)
6. Enter command "gmirror remove gm0 da1"
7. Now on restart, da0 will not boot.
On attempting boot on da0, this is the last output b/f system hangs:
GEOM_MIRROR: Device gm0 created (id=...)
GEOM_MIRROR: Device gm0: provider da0 detected
GEOM_MIRROR: Device gm0 destroyed
GEOM_MIRROR: Device gm0 created (id=...)
GEOM_MIRROR: Device gm0: provider da0c detected
GEOM_MIRROR: Device gm0 destroyed
GEOM_MIRROR: Device gm0 created (id=...)
GEOM_MIRROR: Device gm0: provider da0 detected
GEOM_MIRROR: Device gm0 destroyed
SMP: AP CPU #1 Launched!
Mounting root from ufs:/dev/mirror/gm0s1a
setrootbyname failed
ffs_mountroot: can't find rootvp
Root mount failed: 6
This is 5.4-RELEASE.
The da0 disk is good (I did a surface scan) and I can mount it and
backup the data when I put it in bay #2.
So ...
Did my command in step #6 cause this mess? If so, what should I
have used--forget first?
How can I get this disk to boot again?
m
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