Re: Migrate Data from 18Gb SCSI Drive to 36GB SCSI Drive

From: Bill Verzal (BVerzal_at_KOMATSUNA.COM)
Date: 10/29/04

  • Next message: Andrew Townsend: "Re: Migrate Data from 18Gb SCSI Drive to 36GB SCSI Drive" 
    Date:         Fri, 29 Oct 2004 14:45:28 -0500
To: aix-l@Princeton.EDU

    When you break the mirror with rmlvcopy, the physical copy of the LV is
    removed.

    As well, you can't remove a disk from a VG until all partitions are deleted
    first.

    Also, once a mirror is broken, there is only one "live" copy of the data.
    If you were to be able by chance, replace the "not-live" copies, you could
    potentially lose data.

    BV

    -------------------------------------
    There's no place like /home

    Bill Verzal
    Project Leader, Komatsu America

    (847) 970-3726 - direct
    (847) 970-4184 - fax

                 cbaker@GOODYEAR.C
                 OM
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                                                                       Subject
                                           Re: Migrate Data from 18Gb SCSI
                 10/29/2004 02:23 Drive to 36GB SCSI Drive
                 PM

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    Andrew wrote:

    >> I would do similar to Jason but a little different:

    >> Break the mirror, move all data to one drive, remove empty drive from
    vg,
    >> rmdev empty drive, physically remove empty drive, put new drive in,
    cfgmgr,

    I totally agree with this method that Andrew and other have written. BUT,
    I do have one point/question. The second step, ".... move
    all data to one drive, ....", why would you be moving any data at this
    step? It was a mirror of the same data on both disk drive A
    and B. If you break the mirror, all the same data is on disk A and disk B,
    no? Just remove disk A from the VG and go on an add disk
    C and recreate the mirror. Then, as you point out, break mirror again and
    this time remove disk B from the VG..... There was no "data
    move" there. And, of course, add disk D and re-mirror one more time....
    DONE.

    Am I missing something? Is not the entire disk A mirrored on disk B?

    Christopher M. Baker
    Senior Technical Support Analyst
    DSE/TCO
    Goodyear Tire and Rubber Company

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                 Andrew Townsend
                 <Andrew.Townsend@BISYS.COM>
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                 10/28/04 03:47 PM
    Subject
                                                                   Re: Migrate
    Data from 18Gb SCSI Drive to 36GB SCSI Drive

                             Please respond to
                          IBM AIX Discussion List
                           <aix-l@Princeton.EDU>

    I would do similar to Jason but a little different:

    Break the mirror, move all data to one drive, remove empty drive from vg,
    rmdev empty drive, physically remove empty drive, put new drive in, cfgmgr,
    extendvg, mklvcopy old drive to new drive (to re-establish the mirror),
    rmlvcopy old drive, rmdev old drive, physically remove old old drive,
    insert second new drive, extendvg to second new drive, mklvcopy to second
    new drive.

    Drew

                          Jason delaFuente
                          <jason.delafuente To:
    aix-l@Princeton.EDU
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                          Sent by: IBM AIX Subject: Re: Migrate Data
    from 18Gb SCSI Drive to 36GB SCSI Drive
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                          10/28/2004 03:39
                          PM
                          Please respond to
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    Break the mirror, move all data to one drive, remove empty drive from vg,
    rmdev empty drive, physically remove empty drive, put new drive in, cfgmgr,
    extendvg, migratepv data to new drive, repeat for second drive, mirrorvg

    Jason de la Fuente

    >>> tony_gallo@THRUWAY.STATE.NY.US 10/28/04 02:19PM >>>
    I have a "datavg" volume group that is mirrored from hdisk2 to hdisk3 on
    a 7026 B80. These internal disks are both 18GB scsi drives and I just
    rec'd 2 new drives to replace them. There are no extra drive bays in the
    server. I figure I will need to back up the vg with savevg and then swap
    the drives and do a restvg which I've never done or could I break the
    mirror and the swap 1 drive and remirror and then the other?

    What would be the best/easiest way?

    TIA

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  • Next message: Andrew Townsend: "Re: Migrate Data from 18Gb SCSI Drive to 36GB SCSI Drive"

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