Table of Contents
Advertisement
Updating of the Control Software
At times, NEC may develop and release new functions or features for the disk array unit. These
changes may be made available by upgrading the version of storage control software.
You can update the storage control software by yourself. However, if you fail to update it properly, the
disk array unit may not function properly.
NEC maintenance service representatives can provide the service for updating the storage control
software (at an additional charge). It is strongly recommended that you should ask your NEC trained
maintenance service representative to update storage control software..
RAID Configuration
The RAID configuration in the disk array unit can be used in the combinations shown in the table
below. (G = 1000^3)
RAID type
Number of logical drives
in configuration
Number of logical drives
per subsystem
Storage capacity per
logical drive (When 73-
GB disk drive is used)
*
A combination of disk drives of the same capacity and same rotational speed is required for configuring logical
drives.
The NFx500-SE82E only supports RAID6 and does not support any other RAID configuration.
*1 Two modes (66%-mode and 80%-mode) can be selected according to capacity efficiency.
The RAID types have the following characteristics.
Level
Function
RAID1
Mirroring
RAID5
Striping of data and
redundant data
RAID6
Striping of data and
redundant data
RAID10
Striping of RAID-1
RAID50
Striping of RAID-5
RAID1
RAID5
S2500
1+1
4+1
6 to 120
286.4GB
71.6GB
286.4GB
to 6TB
Advantage
High reliability
High capacity efficiency
High reliability that allows continuous
operation even if two disk drives fail.
Capacity can be expanded for every
drive.
High-speed data read/write
High-speed data read
High capacity efficiency
xxix
RAID6 *1
RAID10
S1500
2x2, 3x2,
4x2, 5x2,
6 to 60
6x2, 7x2,
8x2
1,024 max.
143.2GB
286.4GB
to
to 3TB
572.8GB
RAID50
5x2, 5x4
572.8GB
to
1145.6G
B
Disadvantage
High cost
Low-speed data
writing
Low-speed data
writing
High cost
High induction cost
Advertisement
Table of Contents
