Table 4.6

MegaRAID SCSI 320-2 Specifications (Cont.)

 

 

 

Parameter

 

Specification

 

 

Nonvolatile RAM

32 KB 8 for storing RAID configuration

 

 

 

Memory type

 

One 72-bit 168-pin SDRAM DIMM socket provides

 

 

write-through or write-back caching on a logical drive

 

 

basis. It also provides adaptive read-ahead.

 

 

Operating voltage

5.00 V 0.25 V and 3.3 V +/- 0.3 V

 

 

SCSI controller

2 SCSI controllers for Ultra320 and Wide support

 

 

SCSI data transfer rate

Up to 320 Mbytes/s

 

 

 

SCSI bus

 

Low voltage differential or SE

 

 

SCSI termination

Active, low-voltage differential, or single-ended

 

 

Termination disable

Automatic through cable detection

 

 

Devices per SCSI

Up to 15 wide or seven non-wide SCSI devices. Up to

channel

 

6 non-disk SCSI drives per MegaRAID controller.

 

 

SCSI device types

Synchronous or Asynchronous. Disk and non-disk.

supported

 

 

 

 

RAID levels supported

0, 1, 5, 10, and 50

 

 

SCSI connectors

Two 68-pin internal high-density connectors for 16-bit

 

 

SCSI devices.

 

 

Two ultra-high density 68-pin external connectors

 

 

 

SCSI cables

 

Up to 25 m if using low voltage differential

 

 

 

Serial port

 

3-pin RS232C-compatible connector, used for test

 

 

purposes only

 

 

 

4.10 MegaRAID Components

4.10.1 CPU

The MegaRAID SCSI 320-2 controller uses the 64-bit Intel 80303 Intelligent I/O processor with an embedded 32-bit 80960 Jx RISC processor that runs at 100 MHz. This processor directs all functions of the controller including command processing, PCI and SCSI bus

4-8Features

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