Hi Arnoud!
Let me first say this: I'm not a SCSI expert!
The difference between LVD and HVD SCSI is hardware related.
LVD, which stands for Low Voltage Differential, is also called Ultra 2 or
Fast-40 SCSI. It uses 3 volt instead of 5 volt logic level and is not
directly compatible with the "old" differential (HVD) SCSI. LVD doubles SCSI
data throughput. Cable lengths are 12 m (40 ft). Single initiator-single
target applications may use up to 25 m (82 ft) of cable.
I don't know if there is a way you can physically see if you have a LVD or a
HVD drive or card. As far as I know the SAN Data Gateway comes with 4 HVD
connectors by default. The LVD adapter is a separate feature (FC 2840).
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines