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v Ultrium 2 (read only): 15, 19, 22, 26, or 30 MBps
If the net (compressed) data rate of the server is between two of the active data
rates, the drive calculates the appropriate data rate at which to operate. Speed
matching dramatically reduces backhitch, the condition that occurs when a tape
stops, reverses, and restarts motion. A backhitch is usually the result of a mismatch
between the data rates of the server and the drive.
Channel calibration
System performance is further optimized by a feature called channel calibration, in
which the drive automatically customizes each read/write data channel to
compensate for variations in such things as the transfer function of the recording
channel, the media, and the characteristics of the drive head.
Encryption
The Ultrium 4 Half High Tape Drive supports host Application Managed
Encryption (AME), using T10 encryption methods. Data encryption is supported
with LTO Ultrium 4 Data Cartridges only.
The encryption enabled drive contains the necessary hardware and firmware to
encrypt and decrypt host tape application data. Encryption policy and encryption
keys are provided by the host application, and no encryption setup is required (or
available) for this drive. A drive digital certificate is installed at manufacturing
time. Each drive receives a unique serial number and certificate. The T10
application might validate each drive instance by checking the digital certificate of
the drive.
Application-managed encryption is supported on Windows Server 2003, Linux
and Solaris. Encryption requires the latest device drivers that are available for the
tape drive. To download the latest device drivers, complete the following steps.
Note: Changes are made periodically to the IBM website. The actual procedure
1. Go to http://www-947.ibm.com/support/entry/portal/.
2. In the Search within all of support & downloads text field at the bottom of
3. In the list of search results, click the link Tape Files (index) - Software for tape
SAS interface
A drive with a SAS (Serial Attached SCSI) interface can be linked directly to
controllers. SAS provides better performance than 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 3.0 Gbps. In addition, SAS drives can be hot-plugged.
SAS drives auto-negotiate speed. There are no configurable topologies; therefore,
feature switches are associated with SAS.
The drive contains a dual-port, SFF-8482 SAS connector. The SAS connector
conforms to the Device Free (Plug) Connector form of the SFF-8482 standard
"Unshielded Dual Port Serial Attachment Connector" as defined by the SFF
might vary slightly from what is described in this document.
the screen, type tape files and press Enter.
drives and libraries.
Chapter 1. Product description
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