Adaptec rs Guida Utente
3-8
Cabling and Configuration
Dual Shelf, Single Host
In this configuration two RAIDStation7 Ultra160 SCSI Storage Array shelves are
daisy chained together and connected to a single host system. The SCSI cable is
connected to the top I/O connector (when Storage Array is vertically oriented) of
Shelf 1, the other end of this cable is connected to the host system. The bottom I/
O connector of Shelf 1 is connected to the top I/O connector of Shelf 2 (see Fig-
ure 3-5). The First/Second Shelf ID switch on Shelf 1 should be set to “First” and
on Shelf 2 should be set to “Second”. The Single/Dual Host ID switch on both
shelves should be set to Single. The Dual VEM Enable/Disable ID switch should
be set to “2” on both shelves. No terminator is required because the bottom I/O
connector (closest to power supplies) of each shelf has in-built termination. If
there is a cable attached to this I/O connector, termination is turned off automati-
cally. If there is no cable attached to this I/O connector, termination is turned on
automatically. In the example below, termination is turned off on the bottom I/O
connector of shelf 1 and is turned on on the bottom I/O connector of shelf 2.
daisy chained together and connected to a single host system. The SCSI cable is
connected to the top I/O connector (when Storage Array is vertically oriented) of
Shelf 1, the other end of this cable is connected to the host system. The bottom I/
O connector of Shelf 1 is connected to the top I/O connector of Shelf 2 (see Fig-
ure 3-5). The First/Second Shelf ID switch on Shelf 1 should be set to “First” and
on Shelf 2 should be set to “Second”. The Single/Dual Host ID switch on both
shelves should be set to Single. The Dual VEM Enable/Disable ID switch should
be set to “2” on both shelves. No terminator is required because the bottom I/O
connector (closest to power supplies) of each shelf has in-built termination. If
there is a cable attached to this I/O connector, termination is turned off automati-
cally. If there is no cable attached to this I/O connector, termination is turned on
automatically. In the example below, termination is turned off on the bottom I/O
connector of shelf 1 and is turned on on the bottom I/O connector of shelf 2.
Figure 3-5. Cabling Dual Shelf, Single Host Configuration
Mute
Temp
LVD
SE
PSU 1
0
1
PSU 2
PSU 1
LVD SCSI Cable
connects to Host
connects to Host
Mute
Temp
SCSI Out
LVD
SE
PSU 1
0
1
PSU 2
PSU 1
SCSI Link Cable
Shelf 1
Shelf 2
VEM
Host
Shelf
2
0/1
0/1
1
2
1
2
VEM
Host
Shelf
2
0/1
0/1
1
2
1
2