HSG80 split-mirror problem

From: MMP Rupp Wolfgang (Wolfgang.Rupp@mm-packaging.com)
Date: 04/18/03

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    Date: Fri, 18 Apr 2003 11:57:09 +0200
From: MMP Rupp Wolfgang <Wolfgang.Rupp@mm-packaging.com>
To: "'tru64-unix-managers@ornl.gov'" <tru64-unix-managers@ornl.gov>

    I got a weird problem here: with Command Scripter, a Unix cron
    job triggers mirror splits. Additional units are then created
    and presented to the cluster to "mount -o dual" for backup.

    The problem is that with each split, the cluster sees the units
    as new (additional) devices: last split I had /dev/disk/dsk57-60,
    now I got 61-64. This is reproducible.

    To automate split-mount-save, the split units have to be always
    the same device number because of the file domain definitions.
    What are we doing wrong? An example command scripter input for
    split and rebuild is below.

    Wolfgang Rupp
    Network Administrator

    MM Packaging Europe GmbH
    Floragasse 7
    A-1040 Wien
    Tel: +43 1 50257 238
    Fax: +43 1 50257 260

    ----[split]----
    # cat split_disk_arch.cnfg
    ! create clone of ARCH (d53 ident 2053)
    reduce disk50800 disk61000
    add mir cl3m1 disk50800
    add mir cl3m2 disk61000
    add stripe clone3 cl3m1 cl3m2
    init clone3 nodestroy
    add unit d153 clone3 dis=all
    ena=DU2A-1,DU2A-2,DU2A-3,DU2A-4,DU2B-1,DU2B-2,DU2B-
    3,DU2B-4,DU3A-1,DU3A-2,DU3A-3,DU3A-4
    unmirror disk50800
    unmirror disk61000
    set d153 ident=2153
    ----[rebuild]----
    # cat rebuild_disk_arch.cnfg
    ! delete clone ARCH and rebuild for new one
    del unit d153
    del clone3
    del cl3m1
    del cl3m2
    set mirr14 nopol
    set mirr14 member=3
    set mirr14 replace=disk50800
    set mirr14 pol=BEST_PERFORMANCE
    set mirr15 nopol
    set mirr15 member=3
    set mirr15 replace=disk61000
    set mirr15 pol=BEST_PERFORMANCE 

    ----
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