IBM DU3 manual Installed

One Adapter in Each of Two Using Systems Connected to Two 2104s (Model DU3)

1 1

Maximum of 12

disk drive modules

2104 Subsystem

1 1

Maximum of 12

disk drive modules

2104 Subsystem

2

Using System

2

Using System

Figure 29. One Adapter in Each of Two Using Systems Connected to Two 2104s (Single-Bus Mode)

1	SCSI interface card
2	For HACMP configurations in standby and mutual takeover mode:
	v PCI Dual-Channel Ultra2 SCSI Adapter (type 4-R, feature 6205)
	The two adapters must not be in the same using system.
	v PCI Dual-Channel Ultra3 SCSI Adapter (type 4-Y, feature 6203)
	The two adapters must not be in the same using system.
	The adapters must be in two separate using systems.
	For non-HACMP configurations, the connections can be to either two different using
	systems or to the same using system, but disk drive modules must not be shared:
	v PCI Dual-Channel Ultra2 SCSI Adapter (type 4-R, feature 6205)
	v PCI Dual-Channel Ultra3 SCSI Adapter (type 4-Y, feature 6203)
	v Ultra2 SCSI Integrated port

Attention: This 2104 configuration is not supported on the Linux operating system.

Attention: The SCSI address of the adapter that is connected to the 2104 must be

different from the addresses of the installed disk drive modules. When a second

adapter is connected to a 2104, the SCSI address of that adapter must be different

from the address of the first adapter and the addresses of the disk drive modules

installed in the 2104.

In each 2104, slots 6 and 7 (SCSI addresses 5 and 6) must contain dummy disk

drive modules. Each 2104 can contain no more than 12 disk drive modules.

Appendix A. Operating with RISC Systems 43