RE: Mirroring Vinum Volumes - importance of subdisk sequence on mirrordevice

From: Richard Johannesson (rtjohan_at_syspres.com)
Date: 07/30/03

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    To: <freebsd-questions@freebsd.org>
Date: Wed, 30 Jul 2003 14:11:28 -0700

    It seems dumpconfig provides absolute settings of the subdisks. Might as
    well use those offsets just in case it matters.

    > -----Original Message-----
    > From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-
    > questions@freebsd.org] On Behalf Of Richard Johannesson
    > Sent: Wednesday, July 30, 2003 1:52 PM
    > To: freebsd-questions@freebsd.org
    > Subject: Mirroring Vinum Volumes - importance of subdisk sequence on
    > mirrordevice
    >
    > Question:
    > Is it important that the sequence plexes/sub-disks get created in for the
    > primary drive and the mirrored drive be the same? Any performance penalty?
    >
    > I'm guessing that a different sub-disk creation order will put the sub-
    > disks
    > in different places on a disk.
    >
    > Background - if needed:
    > Have 10 vinum volumes being mapped by 10 plexes to the root drive.
    >
    > To get mirroring, I created plexes/sub-disks for swap, root, and usr using
    > the specific offsets for each on the 2nd hdd device and map them back to
    > their specific volumes they should be mirroring.
    >
    > When I start creating the other plexes/sub-disks on the 2nd hdd and map
    > them
    > back to the volume already setup, I won't be using specific offsets.
    >
    >
    > Thanks,
    > Richard
    >
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