Hitachi Compute Rack CR 210H User Manual page 36

Precautions on building a disk array
HDDs
The HDD used with one disk array must have the same capacity and rotating
speed.
If two or more disk arrays are built on the system unit, HDDs used with each disk
array might be different. If a reserve disk is used, however, care must be taken
for operation. For details, see Reserve disk on page 3-14.
Extension
storage bay
Figure 3-10: Capacity of the HDD to use for disk array
HDD installation location
In consideration of system management, install in a successive extension
storage bay the HDDs to be used with a single disk array. We also recommend to
record disk array and logical drive configurations.
If a failure occurs, however, the installation location depends on whether a
reserve disk is provided. For this reason, make a record each time.
Extension
storage bay
Extension
storage bay
Disk array A
Figure 3-11: HDD installation location
3-14
1
A-0
Disk array A
2
A-1
3
A-2
4 B-0
5 Disk array B
B-1
6
B-2
1
A-0
Disk array A
2
A-1
3 B-0
4
B-1
Disk array B
5
B-2
6
B-3
1
B-0
2 A-0
3
B-1
Disk array B
4
B-2
5
A-1
6 B-3
System Unit Functions
Hitachi Compute Rack 210H User's Guide
Disk array A:
HDD A-0 = A-1 = A-2
Disk array B:
HDD B-0 = B-1 = B-2
However, there is no problem
if A-x ≠ B-x
Disk array A:
Extension storage bays 1 and 2
Disk array B :
Extension storage bays 3 to 6
Disk array A:
Extension storage bays 2 and 5
Disk array B:
Extension storage bays 1, 3, 4, and 6