Appendix D Notes on Use for Data Replication
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(2) Specifications common to Configuration Settings (GUI and CLI)
Configuration Settings (GUI and CLI) process logical disk capacities in megabytes. According
to “(1) Disk array specifications” and common specifications in combination, the capacity unit of
logical disks to be bound is the lowest common multiple of “128KB × number of data disks” and
“1MB (= 1024KB)” as shown in Table D-2.
Table D-2 Capacity Unit of Logical Disks to be Bound
If RAID such as RAID1, which does not use the striping feature, is in use, data is processed in
megabytes. Thus, the capacity unit is “1”. If a capacity is specified, the system recognizes it as
the capacity that the user can use. In this case, logical disks are bound in the specified capacity
+ 2MB (disk management area).
(3) Specifications specific to Configuration Setting (GUI)
Configuration Setting (GUI) specifies a capacity in units of 0.1GB. The capacity is calculated
with 0.1GB = 1024MB/10. In this case, obtain the capacity as follows:
y With Capacity Specification (Individual Setting):
Specified capacity × 1024 → (Decimal places rounded up)*1 → (+2MB)*2 → (Alignment)*3 →
Capacity of LD to be bound
y With Disk Count Specification (Individual Setting):
Free space in RANK/specified number of data disks → (Decimal places rounded up) →
(Alignment)*3 → Capacity of LD to be bound
*1: The value with decimal places being rounded up ensures that the specified capacity is
allocated from the free space in a selected RANK. If the RANK does not contain free
space large enough, logical disks cannot be bound.
*2: A disk management area is added.
*3: Alignment means obtaining a multiple (an outer value for Capacity Specification, and an
inner value for Disk Count Specification) of the capacity (in megabytes) calculated from
Table D-2.
Number of Data Disks 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Capacity Unit (MB) 1 3 1 5 3 7 1 9 5 11 3 13 7 15