Single And Dual Drive-Bus Configurations - Sun Microsystems StorEdge 3000 Series Installation, Operation And Service Manual

4.6 Single and Dual Drive-Bus
Configurations
The drive-bus configuration determines how drives and drive IDs are assigned to
drive channels on the controller.
A single-bus configuration assigns all disk drive IDs in a controller to one channel
(typically CH 0 for the RAID array and CH 2 for an expansion unit).
A dual-bus configuration assigns half the disk drive IDs to CH 0 and the other half
to CH 2 in the RAID array, and then typically adds additional disk drive IDs to both
CH 0 and CH2 when it is connected to an expansion unit.
The following figures illustrate the six standard cabling scenarios for a 12-drive
array:
FIGURE 4-6
FIGURE 4-7
Configuration #1: Single-Bus Configuration With Two Hosts
Configuration #2: Dual-Bus Configuration With Two Hosts
0
Host
1
2
Host
3
0
1 Host
2
Host
3
Chapter 4 Connecting Ports 4-9