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E-Series Systems

How do I maintain shelf and drawer loss protection?

Contributors netapp-jolieg netapp-jsnyder
PDFs

To maintain shelf and 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.