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Chapter 2: Installation
17
The VTrak has four 68-pin, VHDCI SCSI connectors and two separate SCSI
channels. These connectors are used in one of five ways:
• Configuration 1: One VTrak, one Host PC, one SCSI HBA card
• Configuration 2: One VTrak, one Host PC, two SCSI HBA cards
• Configuration 3: One VTrak, two Host PCs, one SCSI HBA card in each
• Configuration 4: Two (or more) VTraks, one Host PC, one SCSI HBA card
(daisy chain)
• Configuration 5: Two VTraks, one Host PC, two SCSI HBA cards
VTrak makes use of SCSI Target IDs (TIDs) and Logical Unit Numbers (LUNs) to
enable multiple VTrak arrays managed by a single Host PC. How to set TIDs and
LUNs is explained on page 97. At this point, proceed with the connection of SCSI
cables following industry standard guidelines and the illustrations on the following
pages.
SCSI Terminator
When the VTrak is the last SCSI device in the chain you must install the Promise-
supplied (or equivalent) external SCSI terminator on both SCSI Connectors (see
below). The SCSI cable or terminator can attach to either SCSI connector. If you
use a SCSI channel, you must attach a SCSI Terminator to it.
Figure 9. If you use a SCSI channel, attach a terminator to it
Caution
Proper termination and SCSI-3 compliant cables are required for
the system to operate correctly. Two external SCSI terminators
and a SCSI-3 compliant cables are included with the VTrak 15110.
VTrak Controller
SCSI
Termi nator
Attach SCSI cable
or Terminator to
either connector
SCSI
Termi nator
SCSI
Channel 1
SCSI
Channel 2