Virtual TapeServer 6.04.01 Installation Guide

Cabling and Connecting VTS | 25
requirements, refer to the storage manufacturer's user manual for the SCSI-based external
storage devices.
To connect VTS to a SCSI-based external storage that uses an MD68 connector, use a cable
with a male VHDCI connector on the VTS side and the appropriate (male or female) MD68
connector on the SCSI storage side. For connector specifics and termination requirements,
refer to the user manual for the SCSI-based external storage devices.
Connecting VTS to SCSI-based external storage that uses a Centronics HVD connector
requires a VTS SCSI converter. Use a cable with a male VHDCI connector on the server side
and a male MD68 connector on the converter side. A second cable is used to connect the SCSI
converter to the SCSI-based external storage. This cable uses a male Centronics connector on
the SCSI converter side and the appropriate (male or female) Centronics connector on the
SCSI storage side. Maximum total cable length between the VTS SCSI converter and the
external SCSI tape drive is 25 meters (82 feet). If a second SCSI tape drive is daisy chained,
the total cable length must remain under 25 meters (82 feet). For connector specifics and
termination requirements, refer to the storage manufacturer's user manual.
Path failover
Path failover is required when more than one physical or logical path exists between VTS and
external disk storage, such as an MSA or HP StorageWorks Enterprise Virtual Array (EVA).
If a path fails, another path becomes active and handles I/O for the LUNs on the failed path.
Only one path is active at a time for a LUN. You can run the multipath -v2 -ll command to
see a list of known multi-pathed disks.