System Setup and Configuration
3.7 DSSI VAXclusters
To measure the ground offset voltage, connect the voltmeter leads to bare
(unpainted) metal on each enclosure.
Note
The ground offset voltage may vary over time if equipment is added
to the system or plugged into the power outlets. Therefore, this
measurement does not guarantee that the voltage will remain within
acceptable limits.
• Maximum single cable length is 15 m (50 ft) between connectors.
• Disconnecting the DSSI cables is NOT allowed while bus is operational.
• Number of DSSI buses per CPU:
CPU
DSSI Buses
KA630
2 KFQSAs on Q–bus
KA640
1 Embedded DSSI Adapter (EDA), 2 KFQSA on Q–bus
KA650/KA655
2 KFQSAs on Q–bus
KA660
1 Embedded DSSI Adapter (EDA), 2 KFQSA on Q–bus
KA670
2 Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA675
2 Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA680
2 Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA690
2 Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA681
2 or 4
1
Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA691
2 or 4
1
Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA692
2 or 4
1
Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
KA694
2 or 4
1
Embedded DSSI Adapters (EDAs), 2 KFQSA on Q–bus
6xxx
6 KFMSAs per system
9000
6 KFMSAs per XMI
12 KFMSAs per system
1
2 embedded DSSI adapters on the CPU module plus 2 DSSI adapters on the optional DSSI
daughter card (KFDDB).
• The minimum OpenVMS revision for DSSI VAXcluster of more than two
nodes with:
a. VAX 4000 Model 400 is OpenVMS 5.5–2
3–20 System Setup and Configuration