Fujitsu ETERNUS DX60 S3 User Manual page 792

Appendix A Parameter List
A.3 Volume Management
• Wide Stripe Size
Description
Input condition/
Display contents
•
If the basic size of the RAID group is 2MB or more, the basic size is specified for Wide Stripe Size even when
"Small" is selected.
•
This function cannot be used to change the "Wide Stripe Size" setting after WSVs are created. To change the
"Wide Stripe Size" value, use the [Start RAID Migration] function. Refer to
for details.
• Concatenation Order
Description
Input condition/
Display contents
Select the Wide Stripe Size for the volumes.
"Wide Stripe Size" is the size of the WSV Unit that is allocated to each RAID group in
series. It is not necessary to change the default setting (Normal) for normal use.
•
Normal
An integral multiple of the basic size for each RAID level (*1). The maximum size is
16MB or smaller.
The actual size varies according to the RAID group type, the number of member
drives, and Stripe Depth.
Select "Normal" to improve random write access performance.
•
Small
An integral multiple of the basic size for each RAID level. The maximum size is 2MB
or smaller.
The actual size varies according to the RAID group type, the number of member
drives, and Stripe Depth.
Note that because the segment size of the volume is small and many host accesses
among multiple RAID groups occur, the performance may be reduced according to
the amount of host I/O.
*1: The basic size (stripe size) when creating a volume. Refer to
each RAID Group" (page 1054)
Select the concatenation order of RAID groups.
It is not necessary to change the default setting (Automatic) for normal use.
•
Automatic
Automatically specify the concatenation order of RAID groups.
If multiple WSVs are already registered, the next available RAID group that enables
the Controlling CM allocation to be distributed evenly is selected as [1] for the
concatenation order. If multiple RAID groups satisfy this condition, the RAID group
with the smallest RAID group number is selected as [1] in the concatenation order.
RAID groups are concatenated starting from [1] (first) in ascending order. The last
RAID group is concatenated to the first RAID group.
Volumes that belong to the RAID group that is first in the concatenation order are
called "representative volumes".
•
Manual
Manually specify the concatenation order of the RAID group.
792
ETERNUS Web GUI User's Guide (Settings)
Copyright 2015 FUJITSU LIMITED
for details.
"3.9 Start RAID Migration" (page 301)
"F.1 Basic Size for
P2X0-1270-13ENZ0