For the ETERNUS DX600 S6

• Hot spare selection criteria (search order for drive enclosures)

  Drive enclosures that meet the following criteria are searched.

  Table: Hot Spare Selection Criteria – Search Order for Drive Enclosures (ETERNUS DX600 S6)

  Priority order	Selection criteria
  1	A drive enclosure that is located in the same path as the failed drive
  2	A drive enclosure that is not located in the same path as the failed drive (*1)

• Hot spare selection criteria (drives)

  Drives that meet the following criteria are searched.

  Table: Hot Spare Selection Criteria – Drives (ETERNUS DX600 S6)

  Priority order	Selection criteria
  1	A hot spare with the same type, same capacity, and same rotational speed (for disks) as the failed drive (*1)
  2	A hot spare with the same type and same rotational speed (for disks) as the failed drive but with a larger capacity (*1) (*2)
  3	A hot spare with the same type and same capacity as the failed drive but with a different rotational speed (for disks) (*1)
  4	A hot spare with the same type as the failed drive but with a larger capacity and a different rotational speed (for disks) (*1) (*2)

  *1	:	If multiple drives are applicable, priority is given to the drives in ascending order of the enclosure number and the drive slot number.
  *2	:	When there are multiple hot spares with a larger capacity than the failed drive, the hot spare with the smallest capacity among them is used first.

The figure below shows an example of a drive search order when a drive failure occurs.

First, drives are selected in the order of priority (1 to 4) among the drives in the drive enclosures that are located in the same path as the failed drive. If there are no applicable drives in the same path, drives that match the drives with the order of priority (1 to 4) are selected among the drives that match priority order 2 in the drive enclosures.

Figure: Hot Spare Selection Criteria (for the ETERNUS DX600 S6)