Virtual TapeServer 8.4 Configuration Guide

36 | Virtual TapeServer Configuration Guide
l Windows Server 2008
Values 0-15 are acceptable.
2. From the Lun drop-down list, select the logical unit number. This number identifies the sub-ID
on the port, and this ID typically ranges from 0-255. For SCSI connections, this ID is typically 0.
Note SCSI devices use target-based addressing. Fibre Channel devices use LUN-based
addressing. For Fibre Channel devices, the LUN determines the unique address of the
device on the port, so you cannot assign a LUN value more than once per port.
For Fibre Channel, the appropriate LUN value depends on the host server:
l NonStop G-series and S-series servers
Set the LUN to 0. 0 is the only value supported by NonStop S servers, which support
SCSI ports only and ignore the LUN.
l NonStop Integrity (NS) and BladeSystem servers
Up to four tape devices are supported per port, therefore you can assign values 0-3 to
the LUN. 0 is typically assigned to the LUN for the first tape device, 1 is typically
assigned for the second tape device, 2 for the third, and 3 for the fourth.
l UNIX servers
In general, set the LUN to any value between 0 and 7. Begin with 0 and increment the
LUN for each additional VTD that is added on a port. The backup management
application determines the ID. Refer to backup management application documentation
and host server to determine the LUN.
l Windows Server 2008
Set the LUN to any value between 0 and 7. Begin with 0 and increment the LUN for each
additional VTD that is added on a port. The backup management application determines
the ID. Refer to backup management application documentation and host server to
determine the LUN.
l IBM i servers
LUN 0 is required. If more than one VTD is created, begin with 0 and increment the LUN
for each additional VTD that is added on a port.
3. In the Serial Number field, specify the serial number of the VTD. You can specify up to 10
alphanumeric characters. On IBMi hosts, 10-digit numeric serial numbers are required (non-
numeric characters are not allowed). This string is presented to the host and should be unique
(across all VTS servers and VTDs in the environment). If you do not specify a serial number, it
is automatically generated.
4. Click Submit.
It is recommended that you back up the VTS database after modifying the VTS configuration. See
"Backing up the VTS server" on page 161 for more information.