Compaq 3000 - Manual (Page 31)

Chapter 1. Product Overview
EK–SMCPQ–UG. C01 1–19
7 SCSI Cables BN37A-OE (2) for Device I/O Module 0
8 SCSI Cables BN37A-OE (2) for Device I/O Module 1
1.8 Specifications
Table 1–2 Controller Shelf Technical Specifications
Feature Description
Model RA3000 rack mount controller shelf (DS-SWXRA-GH, -GK)
RA3000 rack mount disk shelf (DS-SWXRA-GN)
Controller shelf de-
scription BA356 style shelf with one HSZ22 controller, two 180 Watt
power supplies, two host I/O modules, one dual channel
Ultra –wide, single ended personality module, blue
Disk controller shelf BA356 disk SBB shelf with two 180 Watt power supplies,
one single channel Ultra –wide, single ended personality
module, blue
Controller model One HSZ22 standard
Dual active controllers Yes with DS-HSZ22 second controller upgrade
Controller cache 16 MB standard
64 MB standard with two controllers
Backup for cache 1000 VA “Uninterruptable Power Supply”,
standard with controller shelf
Controller operation
(with 2 controllers) Active-active (recommended)
Active-passive (spare)
Controller failover Yes, automatic
Mirrored write-back
cache Yes
Write through cache Yes
Command Queuing Yes, 64 commands
Write gathering Yes
Host channels Two UltraSCSI Wide Differential
Drive channels Two UltraSCSI Wide Single ended
Maximum transfer rate 44.7 MB per second per controller pair
RAID 5 sustained
transfer rate Read – 32.6 MB per second per controller pair
Write – 30.6 MB per second per controller pair