NEC Express 5800/230Eh - Manual (Page 271)

Internal Cabling Diagrams 10-5
„ RAID5 (striping + parity)
Stores data onto four hard disk drives by dividing it (striping) in the same way as RAID0.
With RAID5, parity (redundant data) is also divided and stored on four hard disk drives.
Even if one of the configured hard disk drives becomes faulty, data can be used without
any problem.
IMPORTANT:
„
Because data is read from or written to four hard disk drives
concurrently, the disk access performance is lower than that of the
configuration using only a single disk.
„
Because the parity data is saved, the logical capacity is a little lower
than the total capacity of the four hard disk drives.
To build a disk array, at least two hard disk drives for RAID0 or RAID5, and at least three hard disk
drives for RAID5 are required.
Connect the LED cable provided with the server to the LED connector on the mother board and the
disk array controller for indicating the hard disk drive access status.
You can check the disk status (disk error or rebuilding of disk array) through the disk array
management utility, MegaRAID Storage Manager, coming with the disk array controller.
5.25-inch device bay
DVD-ROM drive
Power
supply
Mother board
IDE
IDE cable SAS cable
LED connector
Disk array
controller
Fourth
hard disk drive
HDD cage
Third
hard disk drive
Second
hard disk drive
First
hard disk drive