Wide Striping; Figure 35 Wide Striping - Fujitsu ETERNUS DX100 S4 Design Manual

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 35 Wide Striping

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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. The
number of concatenated 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 concatenated by Wide Striping.
WSVs cannot be created in RAID groups with the following conditions.
RAID groups that belong to TPPs or FTRPs
•
The RAID group that is registered as an REC Disk Buffer
•
• 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
•
RAID groups without a continuous free area greater than the capacity of the volumes to be con-
•
catenated
Capacity expansion cannot be performed (LDE is not possible) for RAID groups used to config-
•
ure a WSV.
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 created WSVs from an OS or an application that does not support
Advanced Format.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Server
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