■
Selection Criteria
When multiple Global Hot Spares are installed, among the drives that match the selection criteria in the order of
priority for Condition 1, drives that match the selection criteria in the order of priority for Condition 2 are
automatically selected as a hot spare to replace 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.
●
Condition 1
Table 12
Hot Spare Selection Criteria (Condition 1)
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)
*1:
This applies only to the ETERNUS AF650 S3.
●
Condition 2
Table 13
Hot Spare Selection Criteria (Condition 2)
Priority order
Selection criteria
1
A hot spare with the same type and same capacity as the failed drive (*1)
2
A hot spare with the same type as the failed drive but with a larger capacity (*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 2) 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 2) among the drives that match
priority order 2 of Condition 1.
Figure 6
Hot Spare Selection Criteria (for the ETERNUS AF650 S3)
CE#0
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
16
Failure
RAID group
2. Basic Functions
RAID Functions
30
Design Guide
Summary of Contents for ETERNUS AF S3 Series
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