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Functional and Operational Characteristics 3-5
Hitachi Universal Storage Platform V/VM User and Reference Guide
LDEV Striping Across Array Groups
In addition to the conventional concatenation of RAID-1 array groups
(4D+4D), the Universal Storage Platform V supports LDEV striping across
multiple RAID-5 array groups for improved LU performance in open-system
environments. The advantages of LDEV striping are:
• Improved performance, especially of an individual LU, due to an increase in
the number of HDDs that constitute an array group.
• Better workload distribution: in the case where the workload of one array
group is higher than another array group, you can distribute the workload
by combining the array groups, thereby reducing the total workload
concentrated on each specific array group.
The supported LDEV striping configurations are:
• LDEV striping across two RAID-5 (7D+1P) array groups (see Figure 3-3).
The maximum number of LDEVs in this configuration is 1000.
• LDEV striping across four RAID-5 (7D+1P) array groups (see Figure 3-4).
The maximum number of LDEVs in this configuration is 2000.
Array group 1 (7D+1P) Array group 2 (7D+1P)
LDEV#A
A-1
A-2
A-3
A-4
B-1
B-2
B-3
A-2
A-4
B-1
B-3
B-4
A-1
A-3
B-4
B-2
Array group 1 (7D+1P)
Array group 2 (7D+1P)
LDEV#B
LDEV Striping
Figure 3-3 LDEV Striping Across 2 RAID-5 (7D+1P) Array Groups