confirmation of a theory (regarding A3500 disks)

From: Adam and Christine Levin (levins_at_westnet.com)
Date: 04/30/03

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    Date: Wed, 30 Apr 2003 10:59:54 -0400 (EDT)
To: Sun Managers Mailing List <sunmanagers@sunmanagers.org>

    We have a machine with an A3500 attached. It has four LUNs mounted:
    c4t5d0s0
    c4t5d1s0
    c5t5d0s0
    c5t5d1s0

    Each is around 300GB.

    We just added another A3500, because we need bigger disk volumes. What
    I'd like to do is unmount the existing volumes, create DiskSuite
    metadevices out of them, and then create concats with the four new
    volumes, so we'd have:

    d10 = c4t5d0s0 + c8t5d0s0
    d20 = c4t5d1s0 + c8t5d1s0
    d30 = c5t5d0s0 + c9t5d0s0
    d40 = c5t5d1s0 + c9t5d1s0

    Then, I'd just growfs the volumes to be 600GB each.

    I'm pretty sure this should work. The main questionable part is whether
    taking the curret /dev/dsk/c4t5d0s0 (etc) and making metadevices out of
    them will somehow disrupt the data. I know that when we mirror root
    disks, we just create d0 with /dev/dsk/c0t0d0s0, and nothing bad happens,
    so I think this will work. Can anybody confirm that?

    I'd rather do it this way than have to copy the data from the original
    LUNs to metadevices made out of the new LUNs in the second unit -- that
    could take quite a while.

    Thanks very much,
    -Adam
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