Raid Configuration Settings - Fujitsu ETERNUS DX80 S2 User's Manual & Installation Instructions

Chapter 5 Setup
5.1 Basic Setup
5.1.5

RAID Configuration Settings

Use ETERNUS Web GUI to set RAID configurations in the ETERNUS DX Disk storage system.
Perform the following settings:
• RAID group creation
• Volume creation
• Hot spare registration
For regions other than EMEA&I, the RAID groups, the volumes, and the host affinities are configured with the
following factory default conditions.
• RAID groups
RAID groups are configured according to the drive options that are purchased at the same time as the
ETERNUS DX Disk storage system.
• Volumes
One maximum capacity volume is created in each RAID group.
• Host affinities
All of the servers can be connected. Note that "Host groups", "CA port groups", and "LUN groups" are not
created.
To change the factory default settings, delete the current configuration and perform the settings again.
Refer to "ETERNUS Web GUI User's Guide" for details on deleting factory default settings.
This section describes how to perform configuration settings using Standard or Open type volumes.
5.1.5.1 RAID Group Creation
Create RAID groups (groups of drives that configure RAID in the ETERNUS DX Disk storage system) to create
volumes.
• For regions other than EMEA&I, this setting is not required when the RAID groups are set with the factory
default settings. To change the factory default settings, delete the factory settings (LUN mappings,
volumes, and RAID groups) and then create your own RAID groups. For details on deleting factory
settings, refer to "ETERNUS Web GUI User's Guide".
• For RAID5, RAID5+0, and RAID6, ensure that a single RAID group is not being configured with too many
drives. Doing so may increase the time to perform data restoration from parities and Rebuild/Copyback
when a drive fails.
• SAS disks and Nearline SAS disks can be installed together in the same RAID group. Note that SAS disks
and Nearline SAS disks cannot be installed with SSDs or SEDs.
• Use drives that are the same size (2.5" or 3.5"), capacity, and speed to configure RAID groups.
- If a RAID group is configured with drives that have different capacities, all the drives in the RAID group
are recognized as having the same capacity as the drive with the smallest capacity in the RAID group
and the rest of the capacity in the drives that have a larger capacity cannot be used.
- If a RAID group is configured with drives that have different speeds, the performance of the RAID
group is reduced to the speed of the drive that has the lowest speed.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Installation-
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