IBM System Storage TS3500, Введение и руководство по планированию

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You can identify all Ultrium 2 and later Ultrium tape drives by the logo at the
front of the drive or by the label at the rear of the drive's canister. You can identify
the Ultrium 1 tape drive by the label at the rear of its canister. An Ultrium 3
write-once-read-many (WORM)-capable drive can be identified by the level of code
it contains. If the code level is 54K1 or higher, the Ultrium 3 drive is capable of
WORM functionality. Ultrium 3 and newer tape drives with WORM capability can
recognize WORM-compatible media.
Ultrium 3 drives with WORM-capable firmware and newer Ultrium tape drives
read and write non-WORM media. This means that you can load WORM-capable
firmware on your Ultrium 3 and newer tape drives and use any media that are
supported by these drives. In this case, only the data that is written on the WORM
media is treated as WORM data; data written on other types of media can be
overwritten.
Ultrium tape drives do not read from or write to 3592 tape cartridges, and 3592
tape drives do not read or write to Ultrium tape cartridges. Refer to “Mixing
media in drives” on page 37 for detailed information about cartridge and drive
compatibility.
The Ultrium tape drives can read tapes that have been written by non-IBM
Ultrium drives. They also write to tapes that can be read by non-IBM Ultrium
drives.
All generations of Ultrium tape drives and cartridges can reside in the same frame.
When a cartridge is labeled according to proper IBM bar code label specifications,
the last character of its volume serial (VOLSER) number indicates the generation of
the medium. For example, a cartridge with a VOLSER of 000764
L5 is an Ultrium 5
cartridge; a cartridge with a VOLSER of 000764 L4 is an Ultrium 4 cartridge; and so
forth.
To enhance library performance, Ultrium 2 and newer Ultrium tape drives include
speed matching, channel calibration, and power management. Speed matching
dynamically adjusts the drive's native (uncompressed) data rate to the slower data
rate of a server. Channel calibration customizes each read/write data channel for
optimum performance. The customization enables compensation for variations in
the recording channel transfer function, media characteristics, and read/write head
characteristics. Power
®
management reduces the drive's power consumption during
idle power periods.
Encryption
Ultrium 4 and later tape drives are encryption capable, which means they can
convert data into a cipher that ensures data security. To perform encryption, the
drive must be encryption enabled by your selection of one of three methods of
encryption management. Two of these methods, system-managed and
library-managed encryption, require the purchase of FC 1604 (Transparent LTO
Encryption). A key is required to encrypt and decrypt the data. How a key is
generated, maintained, controlled, and transmitted depends on the operating
environment where the Ultrium 4 or later tape drive is installed. Some data
management applications are capable of performing key management. For an
alternative solution, IBM provides a key manager that works in conjunction with
the keystore of your choice to perform all necessary key management tasks. There
is no recovery for lost encryption keys. For more information about encryption, see
Chapter 8, “Tape encryption overview,” on page 215. Also refer to the IBM
Chapter 1. Introduction
19