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Chapter 5 Volume Management
5.2 Functions in the Action Area for Volume
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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● Wide Striping Volume Setting
WSVs are created by concatenating volumes that are the same size in multiple RAID groups. Input
the volume information for the migration destination WSV and the selection information for the
RAID groups, and then specify the RAID groups that are to be concatenated.
● Volume Information
Input the volume information of the migration destination WSV.
• Wide Stripe Size
Select the Wide Stripe Size ("Normal" or "Small") 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 group (*1). The maximum size is 16MB or
smaller.
The actual size varies according to the RAID group type, the number of member disks, and Stripe
Depth.
Select "Normal" to improve random write access performance.
- Small
An integral multiple of the basic size for each RAID group. The maximum size is 2MB or smaller.
The actual size varies according to the RAID group type, the number of member disks, 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.
• The conditions for RAID groups to configure WSVs are as follows:
- The RAID type must be the same
- The number of member drives in the RAID group must be the same
- The Stripe Depth value must be the same
- The disk type (Online/Nearline/SSD/SED) must be the same
(since the access performance of WSVs is reduced, do not select "Online/Nearline".)
- The disk speed must be the same
(RAID groups configured with different speed drives can be selected. Note that this reduces
the access performance for WSVs. It is recommended to select the same speed disks. The
speed of the drives that configure a RAID group can be checked in the [RAID Group Detail]
screen ([Disk] tab).)
- The key group setting is the same as the existing RAID groups
(When "Disk Type" is "SED", RAID groups with the key group setting enabled or disabled can
be selected. Selecting the same key group setting status is recommended. Not doing so
reduces the access performance for WSVs. The key group setting status can be checked with
the "Encryption" field in the [Select RAID Groups] screen.)
- The sequential unused area must be the same size or bigger than the capacity of the
volumes that are to be concatenated
• The number of concatenated RAID groups is from 2 to 64.
• The WSV capacity is from 24MB to 128TB.
• When changing the number of concatenations for a WSV, specifying the existing RAID groups is
required. For the details, refer to "Remarks" in "When the migration destination volume is
"WSV"" (page 131).