NEC Express 5800 User Manual page 351

When you select [New Configuration] or [Add Configuration], the screen as shown below
appears.
Custom Configuration: Allows you to define all aspects of the configuration, RAID level,
Auto Configuration:
with Redundancy
Auto Configuration :
without Redundancy
size, and others.
Automatically creates redundant virtual disk.
Automatically creates non-redundant virtual disk.
IMPOTANT:
"Auto Configuration with Redundancy" is supported only with the
configuration composing of two hard disk drives.
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Hardware