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VIO servers and EMC hdiskpower -NEED HELP

  • 1.  VIO servers and EMC hdiskpower -NEED HELP

    Posted Tue February 21, 2006 10:03 AM

    Originally posted by: SystemAdmin


    Hello,

    I would like to install new vio servers using Powerpath/EMC disks.
    I know how to install powerpath etc... on vios servers but what I don't really understand is the fact that 2 vio servers can have access to the same LUN (Disk EMC ) ? I am referring to the TEC doc EMC, they said: "P5 system can have multiple VIOS LPARs providing access to the same LUN for the same VIOC for Standard Device configurations (no multipathing) and multipathing devices under the control of PowerPath and MPIO. For Standard Device and PowerPath configurations, the VIOS device reservation setting "reserve_lock" will need to be changed (via the chdev command) to "no". For MPIO configurations the VIOS device reservation setting "reserve_policy" will need to be changed (via the chdev command) to "no_reserve"."

    I am trying to understand but I am confused !!! I need your help !
    Example if I have 2 vios connecting to the same hdiskpower
    how I can create my vhost on both vios server with the same configuration ? is it really possible ?
    because it is the same disk EMC and on each vio I should create my vhost (before I have to create the LV etc...)

    I am very confused... with scsi disks it is more easy as we are using to physical disk different and I have to mirror my volume group on the client.

    But if with EMC disks 2 vio server can have access to the same disk, it means that on my client I will not do any mirroring again and it is a very good news because in the case I loose one vio server I will still have access to my disks through the other vio without any errors hdisk (no more hdisk missing!!!)
    But I don't know how to do it. If someone have already confugred vios servers using the same EMC disk and create the LV for the vohst how you do it !!!

    Thanks in advance
    Al.
    #AIX-Forum


  • 2.  Re: NEED HELP

    Posted Wed February 22, 2006 12:46 PM

    Originally posted by: nagger


    Yes you do need help!! - this is the wrong forum.

    I recommend you post it to the Virtualisation Forum
    Got to http://www-03.ibm.com/servers/eserver/pseries/community/
    and select Virtualization

    I am not an expert in Dual VIO Server not EMC but I think you have to use either
    1) multipath I/O so the two paths to the single LUN go via the two VIO Servers
    2) non-multipath and mirror between two LUNs, each one seen via different VIO Server

    Have you found the VIO Server Redbooks
    http://www.redbooks.ibm.com/abstracts/sg247940.html?Open
    http://www.redbooks.ibm.com/abstracts/sg245768.html?Open
    #AIX-Forum


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