mirrorvg without a reboot - Aix

This is a discussion on mirrorvg without a reboot - Aix ; Does anyone know, are the consequences, after mirroring rootvg (bosboot and bootlist) and NOT doing a reboot for quorum disable to take into effect? Has anyone been bit by this? If so, what was your experience? Cheers!...

+ Reply to Thread
Results 1 to 3 of 3

Thread: mirrorvg without a reboot

  1. mirrorvg without a reboot


    Does anyone know, are the consequences, after mirroring rootvg
    (bosboot and bootlist) and NOT doing a reboot for quorum disable to
    take into effect? Has anyone been bit by this? If so, what was your
    experience?

    Cheers!


  2. Re: mirrorvg without a reboot

    On Aug 30, 3:53 am, shp...@yahoo.com wrote:
    > Does anyone know, are the consequences, after mirroring rootvg
    > (bosboot and bootlist) and NOT doing a reboot for quorum disable to
    > take into effect? Has anyone been bit by this? If so, what was your
    > experience?
    >
    > Cheers!


    Quorum is how LVM knows whether to keep you VG online if it looses
    disks. If you have 2 x Disks in rootvg with Quorum on you will have 2
    x VGDAs on hdisk0 and one on hdisk1 .. Quorum on mean that you need
    51% of the disks to keep the VG online. (if you have 3 disks or more,
    then you have a VGDA on each disk) .. if you loose hdisk1 you will be
    ok because you still have 66% of the VGDAs on hdisk0, but if you loose
    hdisk0 you will be left with 33% of the VGDAs (less than 51%) and the
    VG will go down and so will your system. Thats why you turn Quorum
    off, so you can loose either disk and the VG stays online.

    Ref: http://publib.boulder.ibm.com/infoce...ta/quorcon.htm

    HTH
    Mark Taylor


  3. Re: mirrorvg without a reboot

    On 30 Aug, 03:53, shp...@yahoo.com wrote:
    > Does anyone know, are the consequences, after mirroring rootvg
    > (bosboot and bootlist) and NOT doing a reboot for quorum disable to
    > take into effect? Has anyone been bit by this? If so, what was your
    > experience?
    >
    > Cheers!


    Quorum only takes effect on the next varyonvg, so if you dont varyonvg/
    varyoffvg it will keep its old settings - which will be quorum on in
    your case. A reboot is the only way for it to take effect for rootvg.

    HTH
    Duncan


+ Reply to Thread