Wide Striping; Figure 31 Wide Striping - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
Optimization of Volume Configurations

Wide Striping

Wide Striping is a function that concatenates multiple RAID groups by striping and uses many drives simultane-
ously 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 31 Wide Striping

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Wide Striping creates a WSV that can be concatenated across 2 to 48 RAID groups.
The number of RAID groups that are to be concatenated is defined when creating a WSV. The number of con-
catenated RAID groups cannot be changed after a WSV is created. To change the number of concatenated groups
or expand the group capacity, perform RAID Migration.
Other volumes (Standard, SDVs, SDPVs, or WSVs) can be created in the free area of a RAID group that is con-
catenated by Wide Striping.
WSVs cannot be created in RAID groups with the following conditions.
RAID groups that belong to TPPs
•
RAID groups with different stripe size values
•
• RAID groups that are configured with different types of drives
RAID groups that are configured with RAID6-FR
•
If one or more RAID groups that are configured with Advanced Format drives exist in the RAID group that is to
be concatenated by striping to create a WSV, the write performance may be reduced when accessing the cre-
ated WSVs from an OS or an application that does not support Advanced Format.
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
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