Fujitsu ETERNUS DX500 S3/DX600 S3, Design Manual

Page: 30 / 218

●
Condition 1
Table 10 Hot Spare Selection Criteria (Condition 1)
Selection or-
der
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
●
Condition 2
Table 11 Hot Spare Selection Criteria (Condition 2)
Selection or-
der
Selection criteria
1 A hot spare with the same type, same capacity, and same rotational speed (for disks) or same interface speed
(for SSDs) as the failed drive (*1)
2 A hot spare with the same type, and same rotational speed (for disks) or same interface speed (for SSDs) 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) or a different interface speed (for SSDs) (*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) or a different interface speed (for SSDs) (*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) for Condition 2 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 Condition 2 are selected in the order of priority (1 to 4) among the drives that match priority order 2
of Condition 1.
Figure 11 Hot Spare Selection Criteria
DE#00
5
DE#01
6
DE#02
7
DE#03
8
DE#10
1
DE#11
2
DE#12
3
DE#13
4
DE#20
9
DE#21
10
DE#22
11
DE#23
12
DE#30
13
DE#31
14
DE#32
15
DE#33
15
CE
RAID group
Failure
Search order (order of priority described in Table 10 )
:
Priority order 1
:
Priority order 2
2. Basic Functions
RAID Functions
30
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AM-7722-25ENZ0