Comparing The Two Storage Subsystems; Table 7-2 Storage Backplane Specifications - Compaq AlphaServer DS20E Reference Manual

7-4 DS20E Reference Guide

Comparing the Two Storage Subsystems

Drive-to-backplane
Connections
Disk Drives
I 2 C
Temperature monitoring
EEPROM
LEDs
Drive Present
Power connector
Subsystem-to-Subsystem
SCSI connection
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Both the four-slot and six-slot system support: hot-swap, I 2 C system monitoring,
temperature sensing, and drive detection. SCSI connections from system to
system are completed with 68-pin connectors, and drive-to-backplane connections
are made with the SCSI SCA2 connector type.
Table 7-2 compares the four- and six-slot storage subsystems for specifications
and capabilities.
Storage Backplane Specifications
Function
Compaq Confidential – Need to Know Required
Writer: Robert Young Project: Compaq AlphaServer DS20E System Comments:
Table 7-2
Specs/Capabilities
Four-Slot Backplane
Four SCSI connections to
1.6-inch drive carriers (SCA2)
Supports hot-swap
System monitoring
Contains temperature sensor
For non-volatile system information storage
Disk activity for each slot
Status Per Slot
Contains power on detection
+12V and + 5V
Two 68-pin connectors (In/Out)
Six-Slot Backplane
Six SCSI connections to
1.0-inch drive carriers (SCA2)