extending mirrored Logical Volume

From: Andrew Garnett (andrewwdg_at_YAHOO.CO.UK)
Date: 09/19/04

  • Next message: Juan G. Lopez: "Re: Quick question." 
    Date:         Sun, 19 Sep 2004 17:00:07 +0100
To: aix-l@Princeton.EDU

    All,
    We have 2 computer sites, and have our disk SSAs split
    across them via fibre. We built a large filesystem
    across 8 disks at one site and mirrored across to the
    other site. Protection against one site being
    detroyed.

    Now we need to extend. We have added 2 disks at each
    site. How do I ensure that mirror (LV copy) no 1 is
    extended on site 1 disks, and mirror 2 at site 2 ?
    I tried extending on a test disk, and Murphy's Law -
    it extended each LV on the opposite site.
    Obviously, I can break the mirror, extend and then
    re-mirror, but that would mean for a long time we will
    be vulnerable on one copy, and Recovery would take
    days.

    I know that extendlv has the option for allocation map
    file, but everything I read is about mapping one copy
    at a time. Is there a map format for mirrors?
    Or does anyone use some other mechanism for allocating
    specific disks to copies ?
    BTW does it matter? - if the LV was extended across
    the opposite site, would the loss of a site mean AIX
    would carry on with the copy it had ?
    Thanks,
       A

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  • Next message: Juan G. Lopez: "Re: Quick question."

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