Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, Руководство пользователя

Страница: 98 / 186

Single-Ended I/O Modules
5–2 UltraSCSI RAID Enclosure
____________________ Caution ____________________
I/O modules provide termination for both the internal and the
external SCSI buses. Therefore, you must install the same type,
operational I/O modules on each of the six enclosure
connectors.
________________________________________________
The six I/O modules mount on the bottom rear (see Figure 5–2) of the
enclosure. These modules are the interconnection point between the array
controller in the master enclosure and the devices in the expansion
enclosures. In an UltraSCSI RAID subsystem, the I/O modules, the internal
SCSI buses, and the array controller ports all have the same number. For
example, array controller port 2, SCSI bus 2, and I/O module 2 are different
elements of the same logical bus.
Figure 5–2 I/O Module Location
CXO5805A
2
1
4
3
6
5
Ports
The odd numbered ports are in the bottom row and the even number ports
are in the top row (see Figure 5–3). Port 1 is in the lower right corner and
Port 6 is in the upper left corner.
Figure 5–3 I/O Module Numbering
CXO5819A
6 4 2
5 3 1