Host Attachment; Native Fibre Connections; Scsi Connections - ADIC Scalar 100 User Manual

Host Attachment

The Scalar 100 is a SCSI target device supporting communication with a host through fibre or SCSI
connections.

Native Fibre Connections

A library supporting native fibre attachments communicates with a host through an intermediary LUN-1
(Logical Unit Number) interface in one or more installed drives. In this type of connection, a host is
connected directly to a drive rather than a library. Communication is accomplished as a host sends
commands to and receives status or responses from one or more LUN-1 enabled drives.
LTO-3 drive modules support native fibre connections. Each drive has a single LC fibre connector located
in back of the module for attachments.

SCSI Connections

A library supporting SCSI connections can be connected to LTO-1 or LTO-2 drive modules via a SCSI-2
Low Voltage Differential or High Voltage Differential (LTO-1 only) SCSI bus. Both ends of the bus must be
terminated. A terminator is shipped with each library. The SCSI LTO-3 drive module is LVD only. The design
of the library allows the SCSI type (LVD or HVD) to be configured at the customer site with a switch located
on the Library Controller.
Each LTO drive module has two HD-68 connectors for attachments. (When attaching to a 1-byte host, a 1-
byte to 2-byte interposer is required.) Although the library can be attached to a wide SCSI bus, it is not a
wide SCSI device and its SCSI ID must be in the range of 0 to 7. The default SCSI ID for the library is 0.
Libraries that do not have native fibre connection capabilities can be connected to a Storage Area Network
(SAN) via an optional Storage Networking Controller (SNC), where the SNC converts either Fibre Channel
protocol or Gigabit Ethernet (GbE) protocol to parallel SCSI protocol.
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