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Is your first statement intended to indicate that you think 7x storage is the same amount of space as 1X storage? Or just that they must have the same disks ... high performance or high capacity?
Each cell is not a full copy of the other cells. ASM diskgroups on Exadata utilize each cell as a failgroup, meaning that no 2 copies of an allocation unit are placed on the same cell. A half rack of high capacity storage (3TB drives) has 252TB of raw space (12 disks * 7 cells) ~126TB of usable space with normal redundancy, and ~84TB of usable space in high redundancy. As far as disk sizes, on ASM you generally want all disks to be the same size to keep everything balanced evenly. I have a short writeup on Exadata diskgroup storage at http://blog.oracle-ninja.com/2011/12/exadata-diskgroup-planning
What i mean is at ASM level they were all different failgroups, so the effective storage space = Space in one exadata cell.
Correct me if i'm wrong?
andy.colvin wrote:How many copies will be stored ?
no 2 copies of an allocation unit are placed on the same cell.
Normal redundancy - 2copies
High redundancy - 3copies
Can i say like there is 1 to 1 relationship between cell and fail group?
How the striping happens in 12 cell disks of each cell?
How many cell failures can be tolerated?
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
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The answer to your queries are available on the My Oracle Support Community for Exadata
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At your service,
Now it is clear,,,
Thank you so much Dave...