•
Hot spare selection criteria (drives)
Drives that meet the following criteria are searched.
Table 25
Hot Spare Selection Criteria – Drives (ETERNUS DX900 S5)
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 following figures show examples of the search order for drive enclosures if a drive fails in the ETERNUS
DX900 S5 when the RAID group is configured across controller enclosures.
Figure 7
Hot Spare Selection Criteria – Search Order for Drive Enclosures (ETERNUS DX900 S5, Example
1)
CE#0
13
DE#01
14
DE#02
15
DE#E3
24
DE#08
25
DE#09
26
DE#0A
27
DE#EB
36
DE#0C
37
DE#0D
38
DE#0E
39
DE#EF
48
49
50
51
60
96
85
86
95
DE#04
1
DE#05
2
DE#06
3
DE#E7
12
61
62
63
72
73
74
75
84
CE#1
DE#11
DE#12
DE#F3
DE#18
DE#19
DE#1A
DE#FB
DE#1C
DE#1D
DE#1E
DE#FF
DE#14
DE#15
DE#16
DE#F7
Failure
RAID group
Search order (order of priority described in
1:
(Priority order 1)
2:
(Priority order 3)
3:
(Priority order 4)
4:
(Priority order 5)
2. Basic Functions
RAID Functions
46
Design Guide
Summary of Contents for ETERNUS DX S5 Series
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