I have a question about expanding storage on an existing SVM mirror.

I am running Solaris 9 on a SunFire V250 SPARC system. I currently have
two 73 GB drives (c0t0d0 and c0t1d0) set up as a SVM RAID 1 mirror. Each
drive is partitioned as follows:

s0 60.34 GB /
s1 4.00 GB <swap>
s3 4.97 MB <replica>
s4 4.00 GB /var
s5 4.97 MB <replica>

The mirror configuration is as follows:

Mirror d0: [/]
Submirror d10
Submirror d20
Mirror d1: [swap]
Submirror d11
Submirror d21
Mirror d4: [/var]
Submirror d14
Submirror d24

I now have two additional 73 GB drives (c0t2d0 and c0t3d0). I intend to
partition each of these disks with one large s0 partition which includes
all of the available disk space. I would then like to add each as a
concatenation to the root slice on the existing mirrored drives. After
reading the SVM documentation and the various manual pages, I see example
#5 in the metattach(1m) manual page which seems to be stating that the new
disks can be added to the live mirror with the commands:

metattach d10 c0t2d0s0
metattach d20 c0t3d0s0

after which, the space is then expanded using:

growfs -M / /dev/md/rdsk/d0

Questions:

1: Is it really this simple? At first I thought I would have to break
the mirror, add the concatenations to d10 and d20 using metainit(1m),
use growfs(1m) on each of the submirrors and then rebuild the mirror.
However, since I cannot unmount the / or /var filesystems, this
procedure was also unclear. I'm also a bit puzzled how, on a live
system, you could concatenate/grow space on one of the mirrors while
the other one had not yet been expanded. Is SVM simply smart enough
to deal with this situation?

2: Other than partitioning the two new disks identically, is there any
other disk preparation that would be required? I assume that the
growfs(1m) will take care of expanding the filesystem across the
new disks.

3: If the metattach method above works, is it correct to use growfs on
the actual mirror d0 or does it have to be used on each of the d10
and d20 submirrors? I'm concerned about getting this right as I do
not want to clobber my existing OS.

4: Since we are messing around with the / filesystem, is there any need
to rerun metaroot(1m) or modify the /etc/vfstab entries? (I would
assume not.)

5: Is it necessary to update the /etc/lvm/md.tab file after these
revisions with:

metastat -p > /etc/lvm/md.tab

I would assume so, but I never saw any reference to this is the
examples.

6: Any other issues or steps I am missing?

Thanks for any help you can offer.

Regards,
--
Jeff

C. Jeffery Small CJSA LLC 206-232-3338
jeff@cjsa.com 7000 E Mercer Way, Mercer Island, WA 98040