Using Persistent Binding; Logical Unit Number (Lun) Scanning; Host Interfaces; Sas Interface - Overland Storage NEO 200S User Manual

NEO 200s/400s User Guide
• Logical Library 4: Slot 34 through slot 45, 4096 (x1000) through 4107 (0x100B)

Using Persistent Binding

Persistent binding is an HBA function that allows a subset of discovered targets to be bound
between a server and device. Consult your HBA user guide for further information.

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 will not scan beyond LUN 0
and will fail to discover the library. It will only see the tape drive.
NOTE: Some HBAs, such as RAID controllers, do not support LUN scanning.

Host Interfaces

The 2U library and the 4U library can be attached to servers using the following interfaces:
• Serial Attached SCSI (SAS)
• Fibre Channel (FC)

SAS Interface

A drive sled with a SAS interface can be linked directly to controllers. SAS is a performance
improvement over traditional SCSI because SAS enables multiple devices (up to 128) of
different sizes and types to be connected simultaneously with thinner and longer cables; its
full-duplex signal transmission supports up to 6.0 Gb/s. The SFF-8088 SAS connectors on
the Ultrium 5 tape drives are compatible with SAS-1 or SAS-2 cables. The SFF-8088 SAS
connectors on the Ultrium 4 tape drives are compatible with SAS-1 cables. In addition, all
SAS drives can be hot-plugged.
SAS drives will auto-negotiate speed. There are no configurable topologies thus no feature
switches associated with SAS. The SAS Ultrium 4 half-height drive sleds are single ported
and can only be attached to one host. LAN-free drive sharing is not supported. Ultrium 4
SAS drive sleds use the SFF-8088 connection at the drive sled end and SFF-8088 or SFF-
8470 at the host adapter end.

Fibre Channel Interface

Fibre Channel allows for an active intelligent interconnection scheme, called a Fabric, to
connect devices. Everything between the ports on Fibre Channel is called the Fabric. The
Fabric is most often a switch or series of switches that takes the responsibility for routing.
The library allows the selection of the following Fibre channel port behaviors:
10400367-001 04/2012
Drive Type
Ultrium 4 Half-Height
Ultrium 5 Half-Height
©2012 Overland Storage, Inc.
SAS Support FC Support
X
X
Using Persistent Binding
X
X
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