I've just answered my own question apologies for not trying out more things
before I posted. Thanks to the people who tried to help anyway.
Can I ask one more question that I can't answer for myself. Does anyone know
of any issues with growfs'ing logging filesystems (as in UFS logging, not as
in DiskSuite trans devices).
The original problem was that I had a mirror with two sub-mirrors each of a
concat with just one partition.
d45 -m d46 d47
d46 1 1 mc1t70d0s0
d47 1 1 mc1t85d0s0
Each of the partitions had space on the disk at the end of the partition, and
I wanted to grow the mirror into that space. Doing it na´vely with
`metadetach' first submirror from mirror
metadetach d45 d46
`metaclear' first sub-mirror
Use `format' to expand partition
format c1t70d0s0 -> partition -> 0 -> ...
`metainit' first sub-mirror
metainit d46 1 1 mc1t70d0s0
`metattach' first sub-mirror to mirror
metattach d45 d46
Wait for resync to complete
metastat d45 ...
Repeat all the above for second sub-mirror
Didn't change the size of the mirror! The two sub-mirrors were each the new
size, but the mirror stayed the old size, so growfs on it would be no good.
I've just tricked it though. Add the steps of
Find a spare partition
`metattach' it to the second sub-mirror
metattach d47 c1t69d0s0
The mirror magically grows to the size of the first sub-mirror, the
extended d46! (The smallest of d46 and d47.)
`metadetach' the second sub-mirror from the sub-mirror
metadetach d45 d47
`metaclear' the second sub-mirror
`metainit' the second sub-mirror
(now with just its original partition)
metainit d47 1 1 mc1t85d0s0
`metattach' the second sub-mirror back on the mirror
metattach d45 d47
Wait for resync
metastat d45 ...
Beat it! Seems like an omission to me. Seems like the mirror should
recompute its size when a new sub-mirror it attached, as well as when a
partition is concatenated to one of its sub-mirrors. I guess the writers
weren't thinking quite as deviously as me.
I hope this had been too confused, and will help someone in the future.
-- E-Mail: Rob.McMahon@warwick.ac.uk PHONE: +44 24 7652 3037 Rob McMahon, IT Services, Warwick University, Coventry, CV4 7AL, England
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