Figure 6 Hot Spare Selection Criteria (For The Eternus Dx500 S5/Dx600 S5); Table 24 Hot Spare Selection Criteria - Search Order For Drive Enclosures (Eternus Dx900 S5) - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
RAID Functions
*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 6 Hot Spare Selection Criteria (for the ETERNUS DX500 S5/DX600 S5)
CE#0
DE#10
DE#20
DE#30
Search order (order of priority described in
1:
2:
●
For the ETERNUS DX900 S5
• Hot spare selection criteria (search order for drive enclosures)
Drive enclosures that meet the following criteria are searched.
Table 24
Priority order
1
2
3
4
5
RAID group
5
DE#01
1
DE#11
Failure
9
DE#21
13
DE#31
Table
(Priority order 1)
(Priority order 2)
Hot Spare Selection Criteria – Search Order for Drive Enclosures (ETERNUS DX900 S5)
Selection criteria
DEs on the same path as the failed drive
•
DEs that are different from the one with the member drive
•
• DEs in CEs that are different from the one with the failed drive
• DEs in CEs that are different from the one with the member drive
• DEs in the same CE with the failed drive
• DEs on paths that are different from the failed drive
• DEs on paths that are different from the member drives
DEs in CEs that are different from the one with the failed drive
•
DEs in the same CE with the member drive
•
DEs on paths that are different from the member drives
•
• DEs on the same paths as the member drives
6
DE#02
2
DE#12
10
DE#22
14
DE#32
22)
45
7 8
DE#03
3 4
DE#13
11 12
DE#23
15 16
DE#33
Design Guide