World Wide Identifiers; Planning The Fibre Channel Configuration; Direct Connection; Example Sas Fanout Cable - HP StorageWorks 1/8 User's And Service Manual

Figure 7 Example SAS fanout cable
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The Autoloader has a mini-SAS connector on the tape drive. The connector is keyed in location 4,
which is the standard location for end devices. If you use a cable other than the one supplied with
the product, verify that it is keyed in location 4.
CAUTION:
Mini-SAS connectors are keyed. Do not force a SAS cable's mini-SAS connector into the tape drive
mini-SAS connector because it might be keyed differently.
SAS signal rates require clean connections and a minimum number of connections between the HBA
and the device. Do not use adapters or converters between the HBA and the device. HP recommends
a maximum SAS cable length of six meters.
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.

World Wide identifiers

A SAS tape drive is identified by a unique identifier called a World Wide Name (WWN) or World
Wide Identifier (WWID). The Autoloader assigns the World Wide identifier to the drive bay. When
a tape drive is replaced, the World Wide identifier is re-assigned to the new tape drive.

Planning the Fibre Channel configuration

You can connect the Autoloader directly to the server with a host bus adapter (HBA) or indirectly
through a storage area network (SAN) with a switch.

Direct connection

If you plan to connect the Autoloader directly to the server, you will need a 2 Gb, 4 Gb, or 8 Gb
Fibre Channel HBA. An 8 Gb HBA is recommended for LTO-5 tape drives for optimal performance.
30 Installing the Tape Autoloader