NEC S2500 User Manual page 26

The NFx500-SR40E is a high-performance disk array unit designed for use with the NEC
Express5800 (Windows 2000 /Windows Server 2003 / Turbolinux 7 Server / RedHat Linux 7.2 /
Miracle Linux Standard Edition 2.1 / RedHat Enterprise Linux AS 2.1 / RedHat Enterprise Linux ES
2.1), NX7000/NX7700i (HP-UX), and CX5000 (Solaris) systems.
* Ask your sales representative for non-NEC servers (hosts) which are supported and compatible
operating systems.
The storage capacity of this disk array unit can be easily expanded by installing an additional FC disk
drive (optional) into the expansion slot of the disk array unit.
Expansion of the storage capacity of the disk array unit of is also possible by adding an additional FC
or SATA disk enclosure (optional) to the disk array unit.
The disk array unit supports RAID types 1, 5, 6, 10 and 50. If a fault occurs in a single disk drive (2
disk drives for RAID type 6), the disk array unit will continue the operation without loss of data.
Any defective disk drive can be replaced with a new one without system shutdown. Further, the disk
array unit has an auto repair feature which automatically starts data recovery after the replacement of
the defective disk drive.
If a single disk drive is specified as the spare disk, the data in the defective 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 defective disk drive to be automatically recovered in the spare disk as
soon as a disk drive becomes defective. This improves the system reliability.
The disk array unit has a cache memory data hold function when using the battery backup unit (BBU).
This function allows comfortable high-speed data processing to be done with high reliability.
Further, owing to the redundant configuration of the controller, fan, power supply, and battery backup
unit as well as the spare disk drive, high availability is achieved.
See Section 9.2 "Optional Components" for the product names and part numbers of options.
The above features of the disk array unit are effective only for hardware failures
(e.g., the hard disk is physically damaged or inoperative). Any software failure
(e.g., the data is lost or rewritten due to program excursion) is not covered by
these features. Should a software failure occur, the system could seriously be
damaged. To minimize the damage, be sure to back up the data periodically.
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