What is the effective available disk space in exadata

Hi ,
Greetings of the day ,
Is the below understanding correct ?
In a half rack machine there are 7 cells and all are mirror copies of other , so the effective storage space = disk space in one cell .
Further if we have normal redundancy in each cell , then the effective storage space of the whole exadata will be half of the disk space in the cell.
Is there any rule that all the cells must have equal disk space?
In ASM perspective ,
Is there any rule like all the all the fail groups ( 2 or 3 depends on the redundancy level) must have equal size with in a disk group?

Hi udayjampani -
The My Oracle Support Community which covers all support related questions about EXADATA is available under: https://communities.oracle.com/portal/server.pt/community/exadata_general/360
Have you ever visited the Community to exchange, learn, share and get answers to your support related questions?
The answer to your queries are available on the My Oracle Support Community for Exadata
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