【NEC】 DS450

NEC announced in July 1998 the DS450, a small disk array unit that offered high reliability and large storage capacity at an affordable price along with support for Windows NT’s Microsoft Cluster Server (MSCS).

Features of the DS450:
(1) High reliability in a small disk array
Although being a small disk array — defined as having ten or fewer hard disks — the DS450 worked with Windows NT cluster systems and provided the fault tolerance and high reliability of larger disk arrays by having fully redundant controllers, power supplies, fans, and hard disks.
(2) Affordability
The DS450’s cost per GB was 34 percent cheaper than existing models.
(3) Large storage capacity in a compact enclosure
Although only 17.8 x 49.5 x 60 centimeters in size (deskside model), the DS450 could hold up to 35 GB of data in its maximum configuration of six 9 GB class hard disks.
(4) High performance
The Ultra SCSI host interface (Wide SCSI also supported) enabled maximum data transfer speeds of 40 MB per second. The cache memory could be expanded up to 128 MB.
(5) NEC’s own high availability technology
NEC limited performance drops caused by transient errors by including a function that avoided delays in responses to the host computer when a hard disk experienced temporary problems.
(6) Multifunctional
The following functions simplified the operation and maintenance of a highly reliable disk array unit according to the user’s preferences.
  • RAID-0, RAID-1, RAID-5 selectable
  • Supported hot spare, which keeps a hard disk in reserve for continuous operation
  • Supported an optional battery backup function, which saved data in the write cache in the event of a power failure
  • The standard equipped LCD panel indicated faults and various settings
  • Came with the RaidPlus+ management utility for making settings regarding the detection and reporting of array unit faults

NEC also offered a rack mountable model in addition to the normal deskside model for easier integration in users’ rack systems.

Specifications of the DS450 magnetic disk unit
Parameter Specification
Interface Ultra SCSI (Wide also supported)(differential)
Storage capacity (in a RAID-5 array) Minimum configuration: 〜18 GB (three 9 GB class hard disks)
Maximum configuration: 〜35 GB (five 9 GB class hard disks)
Number of hard disks Up to 6
Data transfer speed Up to 40 MB/s max
Number of LUNs Up to 2 (in a RAID-5 array)
Up to 2 (in a RAID-5 array) RAID-0, RAID-1, and RAID-5
Data block length 512 bytes/block
Redundant components Controller, power supply, fan, hard disk module
Hot swapping Yes (for redundant components)
Hot spare (hot standby) Yes
Cache / buffer memory 16 MB standard, 128 MB max.
Cache protection Provided with a battery backup unit (sold separately)
Power supply 100 — 240 VAC, 50/60 Hz
Fans 3
External dimensions [mm] Deskside: 178 x 495 x 600 (w x d x h)
Rack mount: 480 x 177 x 600 (w x d x h)
Weight Deskside: 〜38 kg
Rack mount: 〜32 kg