How to recover a gmirror from a disaster

[Eric Anderson]

Mark Bucciarelli wrote:

>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?
>  
>

I think you wanted to do a 'forget'.. Can you set root to /dev/da0s1a, 
boot up, and then check gmirror status?

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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