6 Replies Latest reply: Nov 28, 2012 1:41 AM by ASHWINPAWARTESL RSS

Viewing read only luns?

Currently Being Moderated

Hi, I've asked this before but didn't get all the info needed. I have two fas2020with the second filer running as my DR, I have snapmirror running on one volume which has LUNS in it. This volume is replicated to filer2, now I understand that I cannot mount the destination(replicated) LUNS as they are on the read only(destination) volume...but my client insists that he be able to see for himself that the replication is working...


So I've read that I can create a flexclone of the destination volume and mount as read/write from here.....however when running through the procedure on the destination filer I receive and error "can't create snapshot for operation"


Can anyone shed some light here or let me know the best way to mount the destination LUN?



  • Re: Viewing read only luns?
    Currently Being Moderated

    So you can mount the snapshot copies of the LUNS…they will be read only,  but will show the client that there is copies of the appropriate data on your DR LUN.


    Snapdrive is the key to doing this really…you can either remount the lun on the production servers or on another box with SD installed.


    In terms of cloning…yes will be able to…when you do a clone, you can either say create new snapshot…or base it on an existing snapshot…do you get the same error with both?


    But would add, just to test that the data is there…just mount a snapshot copy of the LUN and show the user the contents…if they don’t need to change it…no need to clone it…


    Cloning great for DR testing… but not necessary to prove a point!

    • Re: Viewing read only luns?
      Currently Being Moderated

      Thanks PSF,


      The snapdrive sounds like the business....I didn't even know this existed.


      I have also now come across this which is the cause of my failure....I forgot to mention this is a volume level snapmirror.


      "If your snapmirror is VSM (Volume-lavel snapmirror) , then you need to create snapshot on the source which will be replicated to the destination. In VSM, you cannot create snapshots as the dest-volume will be in read-only mode."


      So I need to create a snapshot on the source first.

  • Re: Viewing read only luns?
    Currently Being Moderated

    you can always do a snapmirror break of the volume, check the lun content and then resync again. just do not delete the shared snapshot.

  • Re: Viewing read only luns?
    Currently Being Moderated

    You can do flex lone. Run snap list on a destination mirrored volume. Pick the name of anyone snapshot in the list. At the least, you will see Base snapshot there. 


    Run this cmd:

    Dest>clone create clone_name -b parentvol parentsnap


    For parentsnap you can supply the snap name you picked from the snap list on destvol.


    On a read/write vol, If you don't supply snap name it automatically creates one during cloning. B'cos VSM is read only , you must explicitly   Provide snap name.

More Like This

  • Retrieving data ...