Virtual TapeServer 6.03.41 Operations and Administration Guide

16 | Modifying Virtual Tape Drives
The appropriate ID value depends on the host server:
• For NonStop S servers
IDs 4 and 5 are reserved for tape devices, while other IDs are reserved for other
device types. NonStop S servers default to target ID 5 for tape drives, therefore it
is recommended that you select 5 from the target drop-down list. You can select 4
as the target ID but you must configure the NonStop S server by specifying
“DEVICEID 4” with the SCF ADD TAPE command. (Refer to the NonStop S
server documentation for more information.)
• For NonStop Integrity (NS) servers
In general, you can assign values 0–15 to the target ID (Integrity servers support
Fibre Channel ports only.) Crossroads best practices encourages you to assign
value 5 to the target ID.
• UNIX and Windows servers
In general, any ID greater than 0 can be used for the target ID. The Backup
Management Application (BMA) determines the ID and typically assigns 0 to the
robot in a tape library. Refer to BMA documentation and host server to determine
the target ID.
If the Fibre Channel is configured for the Arbitrated Loop topology, use the Loop
ID as the target ID here. To find the Loop ID, boot VTS while connected to the
Fibre Channel network. Then, after the startup is complete, access the VTS web
interface. Click Supervisor Functions on the navigation pane, click Examine
System Logs, and search for “Loop id.” The ID is typically set to 0 or 1 but it can
be set as high as 255.
f. From the lun drop-down list, select the logical unit number. This number identifies
the sub-ID on the bus, and this ID typically ranges from 0 – 255. The appropriate
LUN value depends on the host server (also, keep the note in step
e in mind when
assigning the LUN):
• For NonStop S servers
Select 0 as the LUN. (0 is the only value supported by NonStop S servers, which
support SCSI ports only and ignore the LUN.)
• For NonStop Integrity (NS) servers
Up to four tape devices are supported per bus, 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.
• UNIX and Windows servers
In general, set the LUN to any value between 0 and 255. Begin with 0 and
increment the LUN for each additional virtual tape device that is added on a bus.
The Backup Management Application (BMA) determines the number. Refer to
BMA documentation and host server to determine the LUN.
g. From the initiator drop-down list, select the SCSI ID of the host bus to which VTS is
connected. This value is set by the host, and the default is 7.
h. In the name field, specify a name for the virtual tape. This name is for use in the web
interface only; it is not presented to the host.
i. Select the media format from the tape_type drop-down list. This property defines the
type of tape that the virtual tape emulates. This property also specifies the icon
selected for the logical drive on web interface pages.
Note Do not select RAID, which is provided for Manufacturing’s purposes only.