gmirror RAID-1: rebuilding freezes machine

[Michael Butler]

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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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