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HP StorageWorks 1/8 User's And Service Manual: Detection Problems After Installing A Sas Device

G2 tape autoloader.
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If you continue to have problems with a parallel SCSI Autoloader, check the following:
Ensure that the device is compatible with the parallel SCSI host adapter and backup application
you plan to use. For a list of compatible parallel SCSI host bus adapters and application software,
check with your parallel SCSI host adapter manufacturer, backup application vendor, or the HP
support website at http://www.hp.com/go/ebs.
NOTE:
The host bus adapter should be SCSI-3 LVDS. A single-ended parallel SCSI host bus 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 http://www.hp.com/go/ebs for current HBA compatibility information.
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.
HP StorageWorks 1/8 G2 Tape Autoloader User and service guide
109

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