Logical Disk Capacity; Arbitrary Logical Disk Capacity - NEC Storage S1300 User Manual

Logical Disk Capacity

Arbitrary Logical Disk Capacity

The management software (NEC Storage Manager) allows you to configure an arbitrary
logical disk capacity. The capacity must be entered in MB (1MB=1024KB).
To calculate the logical disk capacity, first define the striping unit using the following
formula:
Stripe size x number of data disks (excluding parity disk)
The final value must satisfy the following two conditions:
It is a multiple of the striping unit.
It is a multiple of 1024.
For example, if your system consists of 7 disks configured with RAID5 (6 data disks +
1 parity disk), the striping unit will be equal to the following value assuming that data is
written in blocks of 256KB:
256KB x 6 = 1536KB
The logical disk capacity can only be a multiple of 3072KB.
Note:
written to each disk.
1-16 System Overview
The "stripe size" refers to the size of the data blocks