HP ProLiant CL380 Compaq ProLiant CL380 User Guide - Page 225

Separate Logical SCSI Buses, Host Side Bus and the Disk Side Bus. Because there are two logical SCSI

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H-2 Compaq ProLiant CL380 User Guide Separate Logical SCSI Buses The key part of the ProLiant CL380 SCSI ID configuration is to understand that there are two separate logical SCSI buses, each with its own SCSI ID numbering (see Figure H-1). The CR3500 Controllers participate in both the Host Side Bus and the Disk Side Bus. Because there are two logical SCSI buses, it is possible for it to appear that there are duplicate SCSI IDs in the system. However, because the buses are separate, each bus may use the same SCSI IDs. Server Node 1 SCSI Adapter Server Node 2 SCSI Adapter Host Side Host Port 0 Host Port 1 Bus (Channel 0) (Channel 1) CR3500 Disk Drive Bus Side (Channel 2) Bus Host Host Port 0 Host Port 1 Side (Channel 0) (Channel 1) Bus CR3500 Drive Bus Disk (Channel 2) Side Bus Disk Disk Disk Disk Disk Disk Internal Shared Disks Repeater to 4214 External Storage Figure H-1. Separate Logical SCSI Buses

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H-2
Compaq ProLiant CL380 User Guide
Separate Logical SCSI Buses
The key part of the ProLiant CL380 SCSI ID configuration is to understand
that there are two separate logical SCSI buses, each with its own SCSI ID
numbering (see Figure H-1). The CR3500 Controllers participate in both the
Host Side Bus and the Disk Side Bus. Because there are two logical SCSI
buses, it is possible for it to appear that there are duplicate SCSI IDs in the
system. However, because the buses are separate, each bus may use the same
SCSI IDs.
Server
Node 1
CR3500
Host
Side
Bus
Disk
Side
Bus
Host
Side
Bus
Disk
Side
Bus
Internal Shared Disks
SCSI
Adapter
Host Port 0
(Channel 0)
Server
Node 2
SCSI
Adapter
Drive Bus
(Channel 2)
Host Port 1
(Channel 1)
CR3500
Host Port 0
(Channel 0)
Drive Bus
(Channel 2)
Host Port 1
(Channel 1)
Repeater to
4214 External
Storage
Disk
Disk
Disk
Disk
Disk
Disk
Figure H-1. Separate Logical SCSI Buses