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.