gmirror RAID-1: rebuilding freezes machine

[Jared Ring]

I traced the problem back to BIOS booting off ad0 instead of ad1. 
Because ad0 was still a perfectly functioning drive BIOS didnt complain 
about booting off it. Once the kernel started and gmirror loaded it 
proceeded to use ad1, but the kernel was loaded from ad0, which was the 
old, broken one.

I noticed my first partition does start at offset 0 though, is this 
going to come and bite me in the future?

J

Michael Butler wrote:
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> Jared Ring wrote:
> | I have cvsup'd today to make sure I get the updated g_mirror.c, have
> | rebuilt world and kernel, installed both. however when i rebuild the
> | degraded drive the same thing happens.
> |
> | during the rebuild the good drive is reading, but the dirty drive is not
> | gettin written to according to gstat.
> 
> I've been bitten by this - make sure that the first slice on the
> mirrored partition does not start at offset 0.
> 
> For example, this disk is mirrored on slice 2 ..
> 
> imb at aaron:/home/imb> sudo bsdlabel mirror/gm0s2
> # /dev/mirror/gm0s2:
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
> ~  a:   524272       16    4.2BSD     2048 16384 32768
> ~                ^^^^^^^
> ~  c: 284655734        0    unused        0     0    # "raw" part ..
> ~  d:  1048576   524288    4.2BSD        0     0     0
> ~  e:  1048576  1572864    4.2BSD        0     0     0
> ~  f: 282034294  2621440    4.2BSD        0     0     0
> 
>     Michael
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