How do I maintain shelf/drawer loss protection?
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.
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