Detection Problems After Installing A Sas Device - HP StorageWorks MSL2024 User's And Service Manual

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 Library?
• Does the operating system detect the tape drive?
• Does the operating system detect the Library?
• Does the operating system detect the Library, 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 Library:
• 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 Library.
• Check the SAS connectors for damage or debris.
• Verify that your HBA is supported by the host computer and qualified with the Library. Refer
to the EBS matrix at http://www.hp.com/go/ebs for current HBA compatibility information.
• Verify that your HBA has the latest firmware.
• If the application software or operating system detects the tape drive, but not the Library:
• Verify that multiple LUN support is enabled on the HBA. The device uses two Logical Unit
Numbers (LUNs) to control the tape drive (LUN 0) and robotic (LUN 1). The device requires
an HBA with multiple LUN support and multiple LUN support must be enabled on the host
computer. When multiple LUN support is not enabled, the host computer can see the tape
drive, but not the Library.
NOTE:
Many RAID or array controllers do not provide multiple LUN support.
• If the application software or operating system does not detect any devices on the HBA:
• Verify that the SAS host adapter is installed correctly. Refer to the manual that came with your
host adapter for installation and troubleshooting instructions. Pay particular attention to any
steps describing configuration settings. Make sure that the host adapter is properly seated in
the motherboard slot and the operating system correctly detects the host adapter.
• Verify that the proper device driver is installed for the SAS host adapter.
• If the Library is detected by the operating system, but not by the application software:
HP StorageWorks MSL2024, MSL4048, MSL8048, and MSL8096 Tape Libraries User and service
guide 157