Hardware Architecture Features

 

Specification

Feature

 

 

Processor

Intel i960RN

 

 

SCSI Controller

One Q-Logic 12160 Dual SCSI controllers

 

 

memory type

One 64-bit 168-pin SDRAM DIMM socket provides

 

 

 

write-through or write-back caching on a logical

 

 

 

drive basis. It also provides adaptive readahead.

 

 

Size of Flash ROM

1 MB

 

 

Amount of NVRAM

32 KB

 

 

Hardware XOR assistance

Yes

 

 

Direct I/O

Yes

 

 

Removable battery-backed

Yes

 

 

cache memory module

 

 

 

SCSI bus termination

Active, LVD and SE

 

 

Double-sided DIMMs

Yes

 

 

Direct I/O bandwidth

266 MB/s

 

 

 

 

 

Array Performance Features

The MegaRAID array performance features include:

 

Specification

Feature

 

 

Host data transfer rate

266 MB/s

 

 

Drive data transfer rate

160 MB/s

 

 

Maximum Scatter/Gathers

26 elements

 

 

Maximum size of I/O requests

6.4 MB in 64 KB stripes

 

 

Maximum Queue Tags per drive

211

 

 

Stripe Sizes

2 KB, 4 KB, 8 KB, 16 KB, 32 KB, 64

 

 

 

KB, or 128 KB

 

 

Maximum number of concurrent

255

 

 

commands

 

 

 

Support for multiple initiators

Yes

 

 

 

 

 

Chapter 4 Features

27