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sm-storage/how-do-i-maintain-shelf-drawer-loss-protection.html |
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SANtricity, System Manager, E-Series, shelf, drawer, loss, protection |
To maintain shelf/drawer loss protection for a pool or volume group, use the criteria specified in the following table. |
To maintain shelf/drawer loss protection for a pool or volume group, use the criteria specified in the following table.
| Level | Criteria for shelf/drawer loss protection | Minimum number of shelves/drawers required |
|---|---|---|
Pool |
For shelves, the pool must contain no more than two drives in a single shelf. For drawers, the pool must include an equal number of drives from each drawer. |
6 for shelves 5 for drawers |
RAID 6 |
The volume group contains no more than two drives in a single shelf or drawer. |
3 |
RAID 3 or RAID 5 |
Each drive in the volume group is located in a separate shelf or drawer. |
3 |
RAID 1 |
Each drive in a mirrored pair must be located in a separate shelf or drawer. |
2 |
RAID 0 |
Cannot achieve shelf/drawer loss protection. |
Not applicable |
|
Note
|
Shelf/drawer loss protection is not maintained if a drive has already failed in the pool or volume group. In this situation, losing access to a drive shelf or drawer, and consequently another drive in the pool or volume group, causes loss of data. |