Interface specifications and requirements for SAS drives
The server must have an HP or third party SAS host bus adapter with an external connector.
Table 11 SAS drive interface speeds
Supported speedsLTO generation
1.5 Gb, 3 GbLTO-3, LTO-4
1.5 Gb, 3 Gb, 6 GbLTO-5
The device uses multiple LUNs to communicate with the Library. Most SAS RAID controllers do not
support multiple LUNs. Check the EBS matrix at http://www.hp.com/go/ebs to find a SAS HBA that
is supported on your server and qualified with the Library.
Most SAS HBA ports provide four SAS channels. Each tape drive uses one channel. The SAS fanout
cable recommended for this product will connect up to four SAS tape drives to a single SAS HBA
port.
Any of the four drive cable ends can be used for any of the tape drives. If you use a different cable,
verify that the mini-SAS connectors on the tape drive end are keyed for location 4.
CAUTION:
High quality SAS cables rated at the transfer rate of the SAS components are required. Always verify
that the SAS cable you are using is rated for the data transfer speed of the interface of your
components. SAS cables described as "equalized" may not support 6 Gb/s data rates and should
not be used with LTO-5 tape drives unless these cables are verified for 6 Gb/s data rates. For optimum
performance, only use HP cables of the length specified as qualified for your products.
See “About SAS” on page 40 for more information about SAS.
LTO-4 and later generation tape drives and encryption
The LTO-4 and later generation tape drives include hardware capable of encrypting data while writing
data, and decrypting data when reading. Hardware encryption can be used with or without
compression while maintaining the full speed and capacity of the tape drive and media.
Encryption is the process of changing data into a form that cannot be read until it is deciphered with
the key used to encrypt the data, protecting the data from unauthorized access and use. LTO tape
drives use the 256-bit version of the industry-standard AES encrypting algorithm to protect your data.
To make use of this feature you need:
• The HP StorageWorks 1/8 G2 & MSL Encryption Kit or a backup application that supports
hardware encryption.
• LTO-4 or LTO-5 media; no encryption will be performed when writing LTO-3 and earlier generations
of tape.
Table 12 Backward read compatibility
LTO-5 driveLTO-4 drive
IncompatibleIncompatibleLTO-1 media
Features and overview26
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