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Chapter 6 RAID Group Management
6.2 Functions in the Action Area for RAID Group
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
175
Drive combinations that can configure a RAID group
The following table shows the drive combinations that can configure a RAID group.
There are two methods to create a volume: automatic drive selection and manual drive selection.
■ Automatically selecting drives to create RAID groups
The procedure to create a RAID group is as follows:
Procedure
1 Click [Create] in [Action].
2 Select "Automatic" for "Create Mode".
3 Specify the RAID group detailed information, and click the [Create] button.
• Name
Input a RAID group name that is to be created.
An existing RAID group name cannot be used.
The following input conditions apply:
- Up to 16 alphanumeric characters and symbols (except ", (comma)" and "?")
- Space
Online Nearline SSD
Online OK OK NG
Nearline OK OK NG
SSD NG NG OK
• RAID groups can be created when the drives satisfy all of the following conditions:
- The drives are not registered in any RAID group, TPP, FTRP, or REC Disk Buffer
- The drives are not registered as hot spares
- The "Status" is " Present"
• All drives that are selected for creating a RAID group must have the same capacity and the same speed. If
drives of different capacities exist in a RAID group, the smallest capacity becomes the standard, and all
other drives are regarded as having the same capacity as the smallest drive. In this case, the remaining
drive space is not used. In addition, if drives of different speeds exist in a RAID group, the access perfor-
mance of the RAID group is reduced by the slower drives.
• Some combinations of drive types cannot configure a RAID group. Refer to "Drive combinations that can
configure a RAID group" (page 175) for details.
• If both Online disks and Nearline disks are used for a RAID group, the drives in the RAID group will have
different speeds and capacity. In this case, some space cannot be used and the performance is reduced.
• "Striping (RAID0)" has no data redundancy. The use of "High Performance (RAID1+0)", "High Capacity
(RAID5)", "High Reliability (RAID6)", "Reliability (RAID5+0)", or "Mirroring (RAID1)" is recommended.