Ldev Striping Across Array Groups - Hitachi Universal Storage Platform V Reference Manual

LDEV Striping Across Array Groups

In addition to the conventional concatenation of RAID-10 array groups
(4D+4D), the Universal Storage Platform V/VM 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 data drives 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
The maximum number of LDEVs in this configuration is 1000.
•
LDEV striping across four RAID-5 (7D+1P) array groups (see
The maximum number of LDEVs in this configuration is 2000.
Array group 1 (7D+1P)
Figure 3-3
Hitachi Universal Storage Platform V/VM User and Reference Guide
LDEV#A
Array group 1 (7D+1P)
LDEV Striping Across 2 RAID-5 (7D+1P) Array Groups
Functional and Operational Characteristics
A-1
A-2
A-3
A-4
LDEV Striping
A-1
B-2
A-3
B-4
LDEV#B
Array group 2 (7D+1P)
Array group 2 (7D+1P)
Figure 3-3).
Figure 3-4).
B-1
B-2
B-3
B-4
B-1
A-2
B-3
A-4
3-5