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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