Detection Problems After Installing A Sas Device - HP BL536A User's & Service Manual

NOTE:
adapter severely degrades performance. Also, if any SE devices are on the same parallel
SCSI bus, all of the devices on the bus slow down to SE speed, which severely degrades
performance.
The Autoloader is NOT compatible with a standard differential (Diff) or high-voltage differential
(HVD) SCSI bus.
Verify that your HBA is supported by the host computer and qualified with the Autoloader.
Refer to the EBS matrix at
If one of the ports on the device is not connected to another parallel SCSI device, the port
must be terminated. Only the devices physically located at the beginning and end of the
parallel SCSI bus should be terminated. Refer to the manuals supplied with the other devices
on the parallel SCSI bus for information on enabling or disabling termination on those devices.
◦
To terminate the second parallel SCSI port on the device, locate the terminator in the
accessories package and press it firmly into either of the two parallel SCSI connectors
on the back panel. Secure the terminator by tightening the finger-screws until snug. The
supplied terminator is "dual mode" and works on both Low-Voltage Differential (LVD) and
Single Ended (SE) SCSI buses. Check all parallel SCSI and power connections and confirm
that the unit is attached to a valid SCSI SE or LVDS bus.

Detection problems after installing a SAS device

Problems encountered after installation are often caused by improper SAS cable connections,
application software configuration errors, or an incorrectly configured operating system. If the
application software or operating system does not communicate with the device after installation,
determine the extent of the detection problem:
Does the application software detect the tape drive?
Does the application software detect the Autoloader?
Does the operating system detect the tape drive?
Does the operating system detect the Autoloader?
Does the operating system detect the Autoloader, but list it as a generic device?
Based on the extent of the detection problem, check the following:
If neither the application software nor operating system detects the tape drive, or they do not
detect both the tape drive and the Autoloader:
◦
Verify that all SAS cables are securely connected on both ends. If the mini-SAS connectors
that connect to the tape drive and some HBAs will not plug in, check the key. The mini-SAS
connector on the tape drive is keyed at location four, which is the standard location for
end devices. If the connector on the cable is keyed in a different location, not only will
the connector not plug in, but the cable probably will not work.
◦
Check the length and integrity of your SAS cabling. For reliable operation, do not use a
SAS cable longer than six meters. Do not use a cable adapter or converters between the
HBA and the Autoloader.
◦
Check the SAS connectors for damage or debris.
88 Troubleshooting
The host bus adapter should be SCSI-3 LVDS. A single-ended parallel SCSI host bus
www.hp.com/go/ebs for current HBA compatibility information.