Configuring The Raid Controller - NEC HX4500 Service & Reference Manual

Configuring the RAID Controller

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Number of RAID Level
Hard Drives Configured
1 JBOD
2 1
3 5
4 or more 5
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Table 3-8. RAID Configurations
Hard Drives in Description
Array
1 JBOD (Mylex RAID 7) 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 Mirroring (RAID 1) Drives are paired and mirrored.
All data is 100% duplicated on an equivalent drive
(fully redundant).
3 Striping with Parity (RAID 5) Data is striped across
several physical drives. Parity protection is used for
data redundancy.
4 (one standby Striping with Parity (RAID 5) with a standby drive
drive) The array consists of three ON-LINE drives and one
STANDBY drive. The standby replacement drive, or
hot spare, is one of the most important features RAID
provides to achieve automatic, non-stop service with a
high degree of fault-tolerance.
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Configuring Your System 3-17