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2. Basic Functions
Optimization of Volume Configurations
Wide Striping
Wide Striping is a function that concatenates multiple RAID groups by striping and uses many drives
simultaneously to improve performance. This function is effective when high random write performance is
required.
I/O accesses from the server are distributed to multiple drives by increasing the number of drives that configure
a LUN, which improves the processing performance.
Figure 33
Wide Striping
CM#0
Wide Striping creates a WSV that can be concatenated across 2 to 64 RAID groups.
The number of RAID groups that are to be concatenated is defined when creating a WSV. To change the number
of concatenated groups or expand the capacity of RAID groups after a WSV is created, perform RAID Migration.
Volumes can be concatenated up to 128TB.
Other volumes (Standard volumes, SDVs, SDPVs, or WSVs) can be created in the free area of a RAID group that is
concatenated by Wide Striping.
WSVs are created by concatenating RAID groups that have the same state with regard to the following
conditions.
•
RAID level
•
Number of member drives
Stripe depth
•
•
Type of drive to be configured
WSVs cannot be created in the following RAID groups.
•
RAID groups that belong to TPPs or FTRPs
•
RAID groups that are registered as REC Disk Buffers
RAID groups that are configured with RAID6-FR
•
RAID groups without a continuous free area greater than the capacity of the volumes to be concatenated
•
Caution
Capacity expansion cannot be performed (LDE is not possible) for RAID groups that are used to configured
with WSVs.
Server
CM#1
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Design Guide
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