Installation guide

Chapter 4 Installing Mass Storage Devices
43
Primary Cage Dual Bus - SCSI A and B
This is a block diagram of the LH 3000r cage duplexed.
I/O Board
Backplane of
Primary Hot-Swap
Mass Storage Cage
Duplex Board
Channel A:
Used for Top Half
of Cage
Channel B:
Used for Bottom Half
of Cage
PCI Slots
SCSI A
SCSI B
Center Line
Figure 4-6. Primary Cage Duplexed
These are the drive configurations and SCSI IDs for the primary cage duplexed.
1
1
0
12 012
AAABBB
2
2
3
3
4
4
5
5
6
6
Bus B Bus A
Center Line
1
1
0
2 02
AAB
B
2
3
2
4
3
5 6
4
Bus B Bus A
Center Line
Slot Number
Disk Drive
SCSI Device ID
SCSI Bus ID
1
1
0
2
0
12
AA
A
B
B
2
2
Bus B Bus A
Center Line
3 4
3
5
4
6
5
Figure 4-7. Rack-mount Duplex Mass Storage Configurations
NOTE HP recommends the duplexed cage run off SCSI A and SCSI B
so that both the top and bottom halves run at the same speed.