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
Server
ETERNUS AF
CM#0
CM#1
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.
2. Basic Functions
Optimization of Volume Configurations
68
Design Guide
Содержание ETERNUS AF S3 Series
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