StorageTek Installation Manual

96053 Revision L 1-13
Standard Installation Procedure
Host Bus Adapter Requirements
The host bus adapter (HBA) in your server must match the library and drive’s SCSI bus
type. If the interface to the library is HVD, the server must contain an HVD-compatible
HBA; if the interface to the library is LVD, the server must contain an LVD-compatible
HBA.
SCSI Device/Bus Type Issues
The following table lists the possible issues you could encounter if you mix interfaces on
the same bus.
Table 1-1. SCSI Cable Length Restrictions
Application Length Restriction
Single-ended Stub length: 102 mm (4 in.)
5 to 10 MB/s data transfer rate: 3 m (10 ft)
1 to 5 MB/s data transfer rate: 6 m (20 ft)
High voltage
differential
Stub length: 203 mm (8 in.)
1 to 40 MB/s data transfer rate: 25 m (82 ft)
Low voltage
differential
Stub length: 102 mm (4 in.)
1 to 80 MB/s data transfer rate: 12 m (39.37 ft)
Table 1-2. SCSI Device/Bus Types: Issues
If you plug a . . . Into . . . The result is . . .
Single-ended device
Single-ended bus Proper connection
LVD bus Single-ended mode
HVD bus Operation disabled
Low voltage
differential device
Single-ended bus Single-ended mode
LVD bus Proper connection
HVD Potential damage/disabled device
High voltage
differential device
Single-ended bus Disabled device
LVD bus Potential damage/disabled device
HVD bus Proper connection