HP StoreEver MSL4048, Getting Started Manual

Page: 10 / 24

Cable requirements
Most SAS HBA ports have four SAS channels. A tape drive uses one channel, so each HBA port
can support up to four tape drives. You can use a cable with one connector on each end, but
only one channel will be used. The SAS fanout cable recommended for use with the library can
connect up to four SAS tape drives to a single SAS HBA port.
Figure 1 Example SAS fanout cable
Connectors
The host end of the cable must have the same type of connector as the HBA’s external SAS
port.
The tape drive has a mini-SAS connector. The connector is keyed in location 4, which is the
standard location for end devices. If you use a cable other than the one recommended for use
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 port because it might be keyed differently.
CAUTION: Reliable data transfer requires high-quality cables and connections.
•
Always verify that the SAS cable is rated for the data transfer speed of the HBA and drive.
•
Do not use adapters or converters between the HBA and the tape drive. SAS signal rates
require clean connections and a minimum number of connections between the HBA and the
tape drive.
•
SAS cables described as "equalized" might not support 6 Gb/s data rates and should not
be used with LTO-5 or later generation tape drives unless these cables are verified for 6
Gb/s data rates.
•
For optimal performance, only use cables of the length specified as qualified for your products.
Do not use a SAS cable longer than 6 meters.
Choosing a location
The library must be mounted in the enclosed rack rails. If possible, install the library in the middle
or higher part of the rack to avoid dust from the floor and to allow easy access to the mailslot
and magazines.
Place the library in an area with few sources of particulate contamination. Avoid areas near
frequently used doors and walkways, stacks of supplies that collect dust, printers, and smoke-filled
rooms.
Do not place the library on the floor or other carpeted surface.
Do not place the library on its side or upside down.
Do not stack items on top of the library.
10 Planning the installation