Topic
  • 3 replies
  • Latest Post - ‏2014-04-22T19:10:32Z by Mangesh Shirke
8Jagdish
8Jagdish
2 Posts

Pinned topic DS8700 Flashcopy

‏2014-04-10T07:16:25Z |

Hi,

If the flashcopy targets are assigned to the AIX server. and the flash copy is created from source to target volume.

Will the target volume get overwritten with the source volume or it will fail if the target volumes are in used by AIX server.

OR Is it depending on the reservation policy set on hdisks at LVM level.

your anuser would be help full.

  • Mangesh Shirke
    Mangesh Shirke
    43 Posts

    Re: DS8700 Flashcopy

    ‏2014-04-17T12:00:02Z  

    Hi Jagdish,

    Kindly find below answers for your queries.

    1) Once flashcopy is created target will not affect source volume in terms of data integrity. It will not copy any data from target to source until you run reverse flashcopy. If you change target volume that will be changed on on that volume not on source volume.

    2) If you initiate flashcopy again, then target volume will get overwritten.

    3) Flashcopy do not have any relation with LVM.

    Thanks.

    Mangesh Shirke

  • 8Jagdish
    8Jagdish
    2 Posts

    Re: DS8700 Flashcopy

    ‏2014-04-18T16:34:58Z  

    Hi Jagdish,

    Kindly find below answers for your queries.

    1) Once flashcopy is created target will not affect source volume in terms of data integrity. It will not copy any data from target to source until you run reverse flashcopy. If you change target volume that will be changed on on that volume not on source volume.

    2) If you initiate flashcopy again, then target volume will get overwritten.

    3) Flashcopy do not have any relation with LVM.

    Thanks.

    Mangesh Shirke

    Hi Mangesh, Thank for your reply....
    My question is ...

    example LUN 0001 is sourece and 000F is target,
    0001 is assigned to HACMP Cluster server with hdisk reserve policy as no_reserver
    000F is not assigned used for backup purpose.
    If i create mkflash 0001:000F , Yes it will go through and thats normal.
    But by mistake i do mkflash 000F: 0001
    Will the flashcopy fail as 0001 is assigned to HACMP server Or it will overwrite the data.????
    coz when i try this it overwrites data on 0001. I am looking for an option where the flashcopy must fail if the target LUN is assiged to server.
  • Mangesh Shirke
    Mangesh Shirke
    43 Posts

    Re: DS8700 Flashcopy

    ‏2014-04-22T19:10:32Z  
    • 8Jagdish
    • ‏2014-04-18T16:34:58Z
    Hi Mangesh, Thank for your reply....
    My question is ...

    example LUN 0001 is sourece and 000F is target,
    0001 is assigned to HACMP Cluster server with hdisk reserve policy as no_reserver
    000F is not assigned used for backup purpose.
    If i create mkflash 0001:000F , Yes it will go through and thats normal.
    But by mistake i do mkflash 000F: 0001
    Will the flashcopy fail as 0001 is assigned to HACMP server Or it will overwrite the data.????
    coz when i try this it overwrites data on 0001. I am looking for an option where the flashcopy must fail if the target LUN is assiged to server.

    Hi Jagdish,

    Once you create mkflash 0001:000F you will be having flashcopy relationship between 0001 and 000F. Till the time this relationship exists you will not be able to run mkflash 000F: 0001. If you try to do so storage will return error saying that target volume is already part of flashcopy mapping.

    But if you break flashcopy relationship and then mkflash 000F: 0001, though your volume is mapped to host storage will overwrite volume 0001.

    Be aware that if you have flashcopy created between 0001 and 000F by using mkflash 0001:000F, and if you run reverseflash command on this  volumes then it will overwrite data on source volume (0001). This command is basically used to restore flashcopy data on source volume from target.

    I hope this resolves your query. Kindly let me know if anything else is required.

    Thanks.

    Mangesh Shirke