Table 21 Hot Spare Selection Criteria - Drives (Eternus Dx100 S5/Dx200 S5); Table 22 Hot Spare Selection Criteria - Search Order For Drive Enclosures (Eternus Dx500 S5/Dx600 S5); Table 23 Hot Spare Selection Criteria - Drives (Eternus Dx500 S5/Dx600 S5); Figure - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
RAID Functions
■
Selection Criteria
When multiple Global Hot Spares are installed, the hot spare that will replace a failed drive is automatically
selected by searching each drive sequentially according to the selection criteria for hot spares.
Note that a "member drive" refers to a drive that is configured in the same RAID group as the failed drive.
Caution
The drive enclosure path is given priority over the host spare type.
If different drive types are mixed, the recommended action is to install a hot spare for each different drive
type on each path.
Note
The drives in the controller enclosures and the drives in the drive enclosures are treated in the same way.
●
For the ETERNUS DX100 S5/DX200 S5
Drives that meet the following criteria are searched.
Table 21 Hot Spare Selection Criteria – Drives (ETERNUS DX100 S5/DX200 S5)
Priority order
1
2
3
*1: 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.
●
For the ETERNUS DX500 S5/DX600 S5
Hot spare selection criteria (search order for drive enclosures)
•
Drive enclosures that meet the following criteria are searched.
Table 22
Priority order
1
2
Hot spare selection criteria (drives)
•
Drives that meet the following criteria are searched.
Table 23
Priority order
1
2
3
4
Selection criteria
A hot spare with the same type, same capacity, and same rotational speed (for disks) as the failed drive
A hot spare with the same type and same rotational speed (for disks) as the failed drive but with a larger capacity
(*1)
A hot spare with the same type and same capacity as the failed drive but with a different rotational speed (for
disks)
Hot Spare Selection Criteria – Search Order for Drive Enclosures (ETERNUS DX500 S5/DX600 S5)
Selection criteria
A drive enclosure that is located in the same path as the failed drive
A drive enclosure that is not located in the same path as the failed drive (*1)
Hot Spare Selection Criteria – Drives (ETERNUS DX500 S5/DX600 S5)
Selection criteria
A hot spare with the same type, same capacity, and same rotational speed (for disks) as the failed drive (*1)
A hot spare with the same type and same rotational speed (for disks) as the failed drive but with a larger
capacity (*1) (*2)
A hot spare with the same type and same capacity as the failed drive but with a different rotational speed (for
disks) (*1)
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)
44 Design Guide