Logical unit number (LUN) scanning
The library uses a single SCSI or Loop ID per drive and dual LUNs to control the tape drive (LUN 0) and
library accessor (LUN 1). The library requires a host bus adapter (HBA) that supports LUN scanning. If it
is not enabled, your host system does not scan beyond LUN 0 and fails to discover the library. It sees
only the tape drive.
Important: Some HBAs, such as RAID controllers, do not support LUN scanning.
Host interfaces
The 2U library and the 4U library are attached to servers with the following interfaces:
v SCSI (LVD Ultrium 160)
v Serial Attached SCSI (SAS)
v Fibre Channel
Table 19. Host drive interface support
Drive SCSI (LVD Ultra 160) SAS FC
Ultrium 3 FH X X
Ultrium 3 HH X X*
Ultrium 3 HH v2 X*
Ultrium 4 FH X X* X
Ultrium 4 HH X* X
Ultrium 4 HH v2 X* X
Ultrium 5 FH X* X
Ultrium 5 HH X* X
Ultrium 6 FH X
Ultrium 6 HH X* X
Ultrium 7 FH X
Ultrium 7 HH X* X
Ultrium 8 HH X* X
Note: * = Dual Port SAS
SCSI interface
Note: Although the LVD hardware in the library can operate in single-ended (SE) mode, SE operation is
not recommended.
The library supports SCSI LVD attachments with SCSI cables with 68-pin, HD-connectors. SCSI adapters
must be properly terminated.
Before the SCSI cables are installed, inspect all cables for damage. Do not install a cable if it is damaged.
Report the damage immediately by contacting your place of purchase.
The maximum allowable length of your bus cabling depends on the type of SCSI bus that you use (LVD).
v For a server with an LVD SCSI bus:
– Use a maximum system-to-device cable length of 10 m (33 ft) to attach to the host interface board
(SCSI) and one or two daisy-chained drives.
Installation planning 33
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