This is correct, they do have to be the same size.  Whether or not they
have to ID out as absolutely identical varies a little bit by what type of
mirroring you're doing and whose hardware/software you are using, but I've
never seen a mirroring solution that didn't require the disc drives to be
the same size, and for obvious reasons.

John Lee
Vaske Computer Solutions

At 03:34 PM 6/28/01 -0400, Patrick Santucci wrote:
>Pete Vickers asks,
>
>> A customer of theirs has mirrored disks, 4 9gb drives. Is it possible
>> just to replace them with 4 18gb drives without a re-load or anything
>
>If you're thinking of just hot-swapping one half of the 9GB drives with 18GB
>drives, no, I don't think it will work. IIRC the mirroring software requires
>that both halves of a mirrored pair be the same size disk.
>
>There may be other ways to do this, however, using SPLITVS and a
>disk-to-disk copy utility. But we're not talking about 40 drives, just 4, so
>I'm not sure it's worth the work involved. You wouldn't really be down long
>to reload essentially 18GB of data (assuming when you said "4 9gb drives"
>you meant 2 9GB drives mirrored to another 2). I recently had to reload a
>volumeset of 8 9GB drives (unmirrored and approximately 70% full, so around
>9*8*.70=50.4GB) and it took -- if my memory isn't too faulty -- less than 3
>hours using a DDS3 drive.
>
>Patrick
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Patrick Santucci
>HP e3000 Systems Administrator
>Cornerstone Brands, Inc.
>
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