Re: concurrent volume groups

Bob.Kelley_at_BRINKSINC.COM
Date: 11/20/03

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    yes, raw for one....not sure about gpfs tho

    Bobby Kelley Jr.
    972-877-5341

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    so what filesystem goes on there, or is it only suitable for raw?

    -----Original Message-----
    From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
    Bob.Kelley@BRINKSINC.COM
    Sent: Thursday, November 20, 2003 3:19 PM
    To: aix-l@Princeton.EDU
    Subject: Re: concurrent volume groups

    forgot to mention to those of you interested, the reason jfs is not
    supported in concurrent vgs is because of the superblock cache residing in
    host memory...no way to sync this across multiple nodes as of yet...(Shared
    memory possibly?)

    Bobby Kelley Jr.
    972-877-5341

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    Thanks Ferenc!

    I also found a little blurb stating that there is no jfs support for
    concurrent volume groups, and you must have parts of HACMP installed in
    order to use the Concurrent Logical Volume Manager facility. This implies
    to me that you have to have a cluster configuration, with HA sittting in
    the middle to control IO access to the volume group with CLVM managing all
    the volume group changes in your cluster....

    Bobby Kelley Jr.
    972-877-5341

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    My understanding is that enhanced concurrent mode works with gsclvmd, which
    requires topology services and group services. And HACMP provides the
    topology information for RSCT. So I don't think you'll get far.

    --Ferenc

    -----Original Message-----
    From: Bob.Kelley@BRINKSINC.COM [mailto:Bob.Kelley@BRINKSINC.COM]
    Sent: Thursday, November 20, 2003 3:38 PM
    To: aix-l@Princeton.EDU
    Subject: Re: concurrent volume groups

    Thanks for that John

    I forgot to mention this is a 5.1 setup

    Bobby Kelley Jr.
    972-877-5341

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    when i tried to set up a concurrent vg, it complained about certain hacmp
    filesets. i don't know how far into hacmp you need to go, but you need
    some things.

    -----Original Message-----
    From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
    Bob.Kelley@BRINKSINC.COM
    Sent: Thursday, November 20, 2003 2:00 PM
    To: aix-l@Princeton.EDU
    Subject: concurrent volume groups

    Anyone know if concurrent volume groups can be used now without HACMP
    managing the data access? Can I use raw non-SSA SAN volumes?

    What we're trying to accomplish is two Oracle database servers with a
    common shared database, load balanced on the front end. Any ideas or
    experiences would be appreciated?

    Bobby Kelley Jr.
    972-877-5341

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