Features Of Disk Array Unit - NEC NF2300-SR412E User Manual

2. FEATURES OF DISK ARRAY UNIT

The disk array unit has the following features.
NF2300-SR4xxE is a high-performance disk array unit designed for NEC Express5800,
NX7000, and CX5000 systems. NF2300-SR412E, NF2300-SR413E, NF2300-SR414E
and NF23200-SR422E are equipped with three 36GB, 73GB, 147GB and 36GB/15,000
rpm disk drives, respectively.
* Ask your sales agent for non-NEC servers (hosts) which are supported and
compatible operating systems.
You can easily expand the storage capacity by installing additional disk drives (options) in
expansion slots (at shipment: 12 slots) of the disk array unit.
An additional disk enclosure (option) to enable the expansion of the storage capacity of
the disk array unit is provided for the disk array unit.
NF2300-SR4xxE supports RAID levels 0, 1, 5, and 10. If a fault occurs in a single disk
drive, NF2300-SR4xxE can continue the operation without loss of data (except RAID
level 0).
Any defected disk drive can be replaced with a new one without system shutdown.
Further, the disk array unit has the auto repair feature which automatically starts data
recovery after the replacement of the defected disk drive.
If a single disk drive is specified as the spare disk, the data in the defected disk drive can
be immediately recovered in the spare disk. The use of this hot spare feature as well as the
auto repair feature allows the data in the defected disk drive to be automatically recovered
in the spare disk as soon as a disk drive is defected. This improves the system reliability.
The disk array unit has the cache memory data hold function by using cache memory,
power supply, and battery backup unit. The function allows comfortable high-speed data
processing to be done under high reliability.
Further, owing to the redundant configuration of the controller, fan, power supply, and
battery backup unit as well as disk drive, the entire system is not shut down if any part of
the system is defected during operation.
See Section 9.2 "Optional Components" for the product names and part numbers of
options.
Above features of the disk array unit are effective only for the hardware failure
(e.g., the hard disk is physically damaged or inoperative). The software failure
(e.g., the data is lost or rewritten due to program excursion) is not covered by
these features. When the software failure would occur, the system could
seriously be damaged. To minimize the damage, be sure to back up the data
periodically.
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