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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:
Look here for an explanation of the disk layers in Exadata:
create griddisk all harddisk prefix=data, size=100G
Edited by: Uwe Hesse on 01.08.2011 13:19
added the harddisk part
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?
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.
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,