4 Replies Latest reply: Aug 7, 2011 8:05 AM by 625943 RSS

    Exadata Storage Server

    837464
      Hi
      Can some please explain for my question from this command

      cellcli> Create griddisk all prefix='data', size='100g'

      Question :
      1) Is this command will create griddisk in complete celldisk or will create only few griddisk?
      2) how many griddisk will create from this command as default and how?

      Thanks in advance

      Regards
      Limton
        • 1. Re: Exadata Storage Server
          Uwehesse-Oracle
          The command will create one griddisk of the size 1oog on every celldisk on that cell that has sufficient space - typically, it will therefore create 12 griddisks.
          For the unlikely case that Flash Storage is not occupied by Flash Cache, you should add the clause 'harddisk' to the command, though:
          create griddisk all harddisk prefix=data, size=100G
          Look here for an explanation of the disk layers in Exadata:
          http://uhesse.wordpress.com/2011/05/18/exadata-part-vii-meaning-of-the-various-disk-layers/

          Kind regards
          Uwe Hesse

          http://uhesse.wordpress.com

          Edited by: Uwe Hesse on 01.08.2011 13:19
          added the harddisk part
          • 2. Re: Exadata Storage Server
            837464
            Thanks a lot for your update.

            Even I have few more question here

            1) how ASM disk is created, is this ASM disk is created from Cellcli command prompt if not then how this have a link with the Storage disks?

            Regards
            Limton
            • 3. Re: Exadata Storage Server
              Uwehesse-Oracle
              On the Database Nodes, the Griddisks from the Cells automatically appear as ASM (candidate) disks and can there be used to build ASM diskgroups upon.

              Kind regards
              Uwe Hesse

              http://uhesse.wordpress.com
              • 4. Re: Exadata Storage Server
                625943
                The griddisks will apear as ASM disks. By using this ASM disks, we can create ASM diskgroups (in ASM instance).

                Here is the breakdown
                Cell --> 12 Physical disks (harddisks) --> LUNs --> Celldisks --> Griddisks --> ASM diskgroups

                Thanks & Regards,
                Satya
                http://satya-exadata.blogspot.com