Chapter 3. Installing the Library
19
Host Bus Adapters (HBAs)
To get optimum performance from your Spectra T24 library, use a SCSI bus that can
transfer data at a rate that supports the library’s maximum burst transfer speed, as
noted in
Library Storage Capacity
on page 80.
If necessary, install a SCSI HBA, software, and compatible driver(s). Refer to the
documentation for the host computer and the SCSI HBA for detailed information.
Note:
Use a SCSI-3 LVD HBA with the Spectra T24 library.
To ensure optimum performance, Spectra Logic recommends an
Ultra320 HBA for the LTO-3 library and an Ultra160 (or higher)
HBA for the LTO-2 library.
Multiple LUN Support
The Spectra T24 library uses a single SCSI ID per drive and dual LUNs (for the first
drive) to control the tape drive (LUN 0) and library robotics (LUN 1). The library
requires an HBA that supports multiple LUNs. If multiple LUN support 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 allow for multiple
LUN support.
HBA
Drives Per Bus
LTO-2 Drives Per
Bus
LTO-3 Drives Per
Bus
Fast Wide
0
0
Ultra Wide
0
0
Ultra 2 (80)
1
0
Ultra 160
2
1
Ultra 320
2
2