Topic
  • 4 replies
  • Latest Post - ‏2013-03-12T13:39:02Z by SystemAdmin
SystemAdmin
SystemAdmin
4779 Posts

Pinned topic External Storage Virtualisation

‏2013-03-07T16:02:45Z |
Hi,

I presently have a DS4700 which I would like to virtualise behind a new V7000 and keep the existing DS4700 volumes intact i.e. no migration to V7000 disks.
Is it possible to just add the DS4700 as external (once zoning etc in place), create an new empty pool on the V7000 and then add the unmanaged volumes from the DS4700 to the new pool so that they are managed? Will my data still be intact?

Kind Regards
Updated on 2013-03-12T13:39:02Z at 2013-03-12T13:39:02Z by SystemAdmin
  • chriscanto
    chriscanto
    283 Posts

    Re: External Storage Virtualisation

    ‏2013-03-07T17:20:36Z  
    This sounds like the same sort of thing discussed in this thread:
    http://www.ibm.com/developerworks/forums/thread.jspa?threadID=470840

    You can use the system migration wizard in the SVC/V7000 GUI to import external storage as image mode disks.

    If you choose to do this process manually, it is important that you create the volumes as image mode, assuming you do indeed want to keep the data on the volumes. Do not just add the unmanaged mdisks (volumes from the DS4700) to a new pool as that would make them 'managed mode', meaning they'd be available as free storage capacity.

    Regards
  • SystemAdmin
    SystemAdmin
    4779 Posts

    Re: External Storage Virtualisation

    ‏2013-03-07T21:32:30Z  
    Thanks for your reply.
    I thought that image mode was not recommended and should only be temporary. My servers are clustered, can I still use the wizard?
    Will the data say on the DS4700 storage?

    Regards
  • chriscanto
    chriscanto
    283 Posts

    Re: External Storage Virtualisation

    ‏2013-03-11T10:58:10Z  
    Thanks for your reply.
    I thought that image mode was not recommended and should only be temporary. My servers are clustered, can I still use the wizard?
    Will the data say on the DS4700 storage?

    Regards
    You're right that image mode is really only intended for migration scenarios, rather than normal running, but in your original post you said you wanted to "keep the existing DS4700 volumes intact i.e. no migration to V7000 disks". If you don't intended to migrate the data off the DS4K then it will need to continue to be accessed as image mode volumes.

    If your servers are clustered then it would be recommended to perform the migration steps manually, as you need to ensure all volumes are mapped to the correct set of hosts with the correct SCSI logical unit number. You can use the 'import' action on the External Storage panel in the GUI to create image mode volumes from unmanaged mdisks. This will create volumes in a "migration pool", but you can then rename the pool (and the mdisks and vdisks) to be whatever you want to call things. You can then create hosts and add the required volume mappings.
  • SystemAdmin
    SystemAdmin
    4779 Posts

    Re: External Storage Virtualisation

    ‏2013-03-12T13:39:02Z  
    Thanks
    Appreciate your help