Fujitsu ETERNUS DX60 S3 User Manual page 532

Chapter 5 RAID Group Management
5.1 Create RAID Group
■ Manually selecting drives to create RAID groups
Requirements for selecting drives
• The drive requirements for creating RAID groups are listed below.
- The drive status is "
- The drives are not registered in any RAID group, TPP, FTRP, REC Disk Buffer, or EXCP
- The drives are not registered as hot spares
- If "High Performance (RAID1+0)", "High Capacity (RAID5)", or "Reliability (RAID5+0)" is selected for the
RAID level, drives that are 6TB or larger (except SSDs and SSD SEDs) cannot be specified.
• Drive recommendations for creating RAID groups are listed below.
- Use drives that are the same size 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 performance of the RAID group is reduced by
the slower drives.
- Select the same type of drive (Online/Nearline/SSD/Online SED/Nearline SED/SSD SED).
(Although "Online" type drives and "Nearline" type drives can be used in the same RAID group, using
only "Online" type drives or using only "Nearline" type drives is recommended. Also, "Online SED" type
drives and "Nearline SED" type drives can be used in the same RAID group, but using only "Online SED"
type drives or using only "Nearline SED" type drives is recommended. This is because the available
capacity and the access performance may be reduced when these drives are used in the same RAID
group.)
- Select the same SSD type (SSD-M/SSD/SSD-M SED). If different types of SSDs exist in a RAID group, the
access performance for all SSDs in the RAID group is adjusted to the SSD of the lowest interface speed.
- If the host connection environment does not support Advanced Format (AF), select non-AF-compliant
drives (*1). If AF-compliant drives (*2) are selected, a data format conversion occurs and the drive
access performance is reduced. When the host to be connected supports AF, both AF-compliant and
non-AF-compliant drives can be selected.
*1: Drives (such as 2.5" Online, 2.5" Nearline) where "AF" is not displayed for the type.
*2: Drives (such as 2.5" Online AF, 2.5" Nearline AF) where "AF" is displayed for the type.
- When "High Performance (RAID1+0)" or "Mirroring (RAID1)" is selected for the RAID level, allocate the
drives (mirroring pair drives) by dividing them into two or more connection lines (for the ETERNUS
DX500 S3/DX600 S3).
- When "High Capacity (RAID5)", "High Reliability (RAID6)", or "High Reliability (RAID6-FR)" is selected for
the RAID level, allocate the drives (multiple drives configuring a striping) by dividing them into two or
more connection lines (for the ETERNUS DX500 S3/DX600 S3).
• There are conditions for the ETERNUS DX8700 S3/DX8900 S3 drive layout. Refer to
ETERNUS DX8700 S3/DX8900 S3 drive layout" (page 528)
The procedure to create a RAID group is as follows:
Procedure
1
Click [Create] in [Action].
2
Select "Manual" for "Create Mode".
Present"
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