Primary Storage

Expand all | Collapse all

FlashSystem A9000 Clones of the Volumes

Jump to Best Answer
  • 1.  FlashSystem A9000 Clones of the Volumes

    Posted 15 days ago
    We have A9000 FlashSystems.  We are migrating from one array to another. So, before migration we want to create clone copies of the volumes to be migrated.
    How can we do that in IBM A9000/A9000R. We don't want to use snapshots of the volumes, as during the migration those will be automatically deleted in our case, as we are using mobility function. So, what is the way to create clone(exact copies) of the volumes prior to the migration, so that in case required we can restore or map the clone copies to get back to the original state.
    Thanks for any pointers and assistance in this.

    Thank You.


    ------------------------------
    Sudhir BISHT
    ------------------------------


  • 2.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 14 days ago
    Hi,
    it is a Vol-Copy cmd, which will be a full copy=Clone, the full vol copy is instant, the copy happen in background, 


    Roger Eriksson
    Systems Lab Services EMEA/Senior Storage Consultant
    Phone: 46-70-7933518
     
    Nordic Spectrum Storage User Group
     Meetup 2 Jun, 2021
    Registration: ibm.biz/NSSUG2021

    Såvida annat inte anges ovan: / Unless stated otherwise above:

    IBM Svenska AB

    Organisationsnummer: 556026-6883

    Adress: 164 92 Stockholm





  • 3.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 14 days ago
    Thanks Roger.  This is what I was looking for.

    ------------------------------
    Sudhir BISHT
    ------------------------------



  • 4.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 13 days ago

    Hi ,

     

    Dear members,

     

    I have a confusion here what is the difference between 5639-CBD  & 5639-CBE.  If we want to apply a SWMA renewal in an MES Upgrade Configuration after 3 years, will we apply AFL or Renewal. I believe it will be Renewal

     

     

    Khurram Saood
    Sr. Platform Solution Specialist


    GBM Pakistan
    T:  +92 21 3432 3801-12 Ext: 233 

     

    M: +923332105300  

    E:  khurram@gbmme.com 


    1st  Floor, Dadex House , 34-A/1, PECHS Block 6 
    Shahrah-e-Faisal, Karachi 75400, Pakistan
    www.gbmme.com

    A close up of a logo  Description automatically generated  

    Please consider the environment before printing this email.
    Disclaimer: This message and any attachments are confidential and intended solely for the addressee(s).
    Any unauthorized use or dissemination is prohibited.
    GBM Pakistan is not liable for the message if altered, changed or falsified.

     






  • 5.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 8 days ago
    Hi Roger.   Thanks again for the reply.

    As I understand vol_copy is immediate , and the data copy then happens in the background.

    We want to use this vol_copy to make a safe copy of the volumes which we are going to migrate, and just in case we have to use them, if the migration fails. So, want to know and calculate how early prior to intervention window, I should run this command, so that it has as latest copy of the data as possible.  Like, I run it one hour before the window, so that it copies 2TB LUN by that time.  And, I don't want to be in situation that background copy was still happening at that time. Need to make sure that full copy has been done.
    Do you info on this. I came to know from support that The copy is purely metadata which points to the state of the volume at the time the vol_copy was initiated and any 'new' data in the original volume is tracked separately.
    vol_copy creates a set of pointers which essentially fork a volume and changes to the original are tracked in the first prong of the fork while changes to the copy are tracked in the second.

    Our idea is to use the new copy in case , we had to after the migration, or in case there is some issue in the migration.

    Will the clone copy can be used in that case. Like, we want to them map the clone volumes to the hosts and bring it up like it was at the start of migration. This is the only goal here.

    Thanks.



    ------------------------------
    Sudhir BISHT
    ------------------------------



  • 6.  RE: FlashSystem A9000 Clones of the Volumes
    Best Answer

    Posted 8 days ago
    Hi Sudhir,

    The A9k is a fully virtualized system, so no vopy will occur, let me try to explain why.

    you dont have to wait for the copy, as you say the vol-copy cmd create a new set of pointers to the data blocks,
    ex.
    So vol1 owns data block 123, when vol-copy is issues a vol2 is created with same pointers to data block 123.
    If Vol1 is deleted for some reason, only the pointers for vol1 is deleted.
    If you start changing blocks on vol1 or vol2 they will be independent data blocks and belong to the vol that changed them.

    Roger Eriksson
    IBM Nordic Lab Services Storage/IBM Technical Sales Storage
    Phone: 46-70-7933518
     
    Nordic Spectrum Storage User Group
     Meetup 2 Jun, 2021
    Replays avail: ibm.biz/NSSUG2021

    Såvida annat inte anges ovan: / Unless stated otherwise above:

    IBM Svenska AB

    Organisationsnummer: 556026-6883

    Adress: 164 92 Stockholm





  • 7.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 8 days ago
    Thanks Roger.   Got it.

    So what do you suggest on the below:
    a) What will be the appropriate time to kick-off vol_copy prior to the migration.  Like one hour before the window, etc.
    b) Or, it can be run well ahead of the migration window, as it seems it keeps updating the copied vol2 as well, time to time, as it is a pointer.   Is that correct.

    Regards...

    ------------------------------
    Sudhir BISHT
    ------------------------------



  • 8.  RE: FlashSystem A9000 Clones of the Volumes

    Posted 7 days ago
    Hi,

    a. any time before migration
    b. no, it will only keep the data blocks from the time you did vol-copy cmd, so all data-blocks that was owned by vol when vol-copy was issued, will also be owned by new vol, when a data block on original vol chnages afterwards, the old data-block will only be owned by new vol

    ex.
    vol1 owns data block 123
    vol copy is issued and vol2 is created with also pointers to 123
    then vol1 is changed to 124,
    vol2 will still have 123 and if needed you can map vol2 to another host and read 123

    //Roger

    Roger Eriksson
    IBM Nordic Lab Services Storage/IBM Technical Sales Storage
    Phone: 46-70-7933518
     
    Nordic Spectrum Storage User Group
     Meetup 2 Jun, 2021
    Replays avail: ibm.biz/NSSUG2021

    Såvida annat inte anges ovan: / Unless stated otherwise above:

    IBM Svenska AB

    Organisationsnummer: 556026-6883

    Adress: 164 92 Stockholm