NEC MH4500 - Manual (Page 65)

Configuring Your System 3-21
DACCF Configuration Utility
The DACCF utility is included with the AcceleRAID™ 250 Controller. The
AcceleRAID™ 250 supports various versions of RAID technology (referred to
as RAID levels). To use any RAID level, you must configure the RAID
controller using the DACCF Configuration Utility prior to installing your
Network Operating System. For an explanation of this utility, refer to the Disk
Array Controller Configuration Utilities Manual that was shipped with the
controller. Chapter 2 (Preparing the Array) covers array hardware preparation,
configuration, and initialization. After completing the steps in Chapter 2, you
can install your Network Operating System.
Factory RAID Configurations with SCSI Hard Drives
Number of
Hard Drives RAID Level
Configured Hard Drives
in Array
Description
1 JBOD 1 JBOD (RAID 0) JBOD is an acronym for Just a
Bunch Of Disks. Each drive can operate
independently as with a common host bus adapter;
or multiple drives may be spanned and seen as a
single very large drive. No redundancy is provided.
2 1 2 Mirroring (RAID 1) Drives are paired and mirrored.
All data is 100% duplicated on an equivalent drive
(fully redundant).
3 5 3 Striping with Parity (RAID 5) Data is striped across
several physical drives. Parity protection is used for
data redundancy.
4 5 3 plus 1 hot
spare drive Striping with Parity (RAID 5) Data is striped across
three physical drives. Parity protection is used for
data redundancy. This drive is used as the “Hot
Spare.”
5 or more _ _ The first four disks are as stated above. The
remaining disks are not part of the array, but are
ready to be configured.