Troubleshooting guide

7-4 DS20E Reference Guide
Compaq Confidential – Need to Know Required
Writer: Robert Young Project: Compaq AlphaServer DS20E System Comments:
Part Number: ER-K8F6W-UA .A01 File Name: h-ch7 Using the Storage Subsystem.doc Last Saved On: 10/4/99 11:13 AM
Comparing the Two Storage Subsystems
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.
Table 7-2
Storage Backplane Specifications
Function Specs/Capabilities
Four-Slot Backplane Six-Slot Backplane
Drive-to-backplane
Connections
Four SCSI connections to
1.6-inch drive carriers (SCA2)
Six SCSI connections to
1.0-inch drive carriers (SCA2)
Disk Drives Supports hot-swap
I
2
C
System monitoring
Temperature monitoring Contains temperature sensor
EEPROM For non-volatile system information storage
LEDs
■ Disk activity for each slot
■ Status Per Slot
Drive Present Contains power on detection
Power connector +12V and + 5V
Subsystem-to-Subsystem
SCSI connection
Two 68-pin connectors (In/Out)