Virtual TapeServer 6.04.01 Installation Guide

Cabling and Connecting VTS | 21
Checking SCSI termination
All VTS SCSI ports are internally terminated. Check that appropriate termination is
installed at the opposite end of the SCSI bus for all NonStop S-series servers and external
SCSI storage devices.
Note that some older NonStop servers, such as the S7000, require an in-line SCSI terminator.
This pass-through device sits between the external SCSI connector of the PMF board on the
NonStop and the cable that connects to the SCSI converter. The terminators are required for
PMF units through the S72000 models and early S74000 models. To determine if the PMF
requires an external terminator, note the PMF model number. Any PMF labeled with a model
earlier than 1970-A requires the terminator.
Also, a terminator is required when you connect physical tape or disk storage using SCSI.
Each bus (HVD or LVD) requires proper termination. The terminators are typically supplied
with the device hardware.
Cabling the SCSI converter to VTS server module
When the cabling between the SCSI converter and host server is complete, connect the SCSI
converter to the VTS server module. The VTS server module uses LVD SCSI with a VHDCI
style connector. SCSI termination is handled internally, so external termination is not
required.
The SCSI converter uses a female MD68 connector, so the SCSI cable must have a male MD68
connector at that end. The VTS server module uses a female 68-pin VHDCI connector, so the
SCSI cable must have a male VHDCI connector at that end.
The rear of the VTS server module has slots for multiple dual-channel SCSI cards. The
VHDCI SCSI ports on the VTS server unit are clearly visible.
LVD SCSI supports a maximum cable length of 12 meters (39 feet). Because the VTS SCSI
converter is located in the same rack or cabinet as the VTS server module (usually the SCSI
converters are located adjacent to the server module), it is recommended that the cable length
between the SCSI converter and the VTS server module be limited to 2 meters (6.5 feet). Each
VTS model that includes SCSI converters also includes 6-foot male MD68 to male 68 VHDCI
SCSI cables to connect the VTS server module and the SCSI converter.