Dell PowerVault TL4000 Betriebsanleitung PDF herunterladen (Seite 60)

9 Troubleshooting

9.1 Installation problems

Problems encountered during the installation of the library are usually caused by improper SCSI bus

configuration, application software configuration errors, or an incorrectly configured operating system.

If the application software that you are using is not communicating with the library after installation,

check the following:

 SCSI ID: The library uses a single SCSI ID. Depending on other devices attached to the same SCSI

bus and their SCSI IDs, you may need to change the SCSI ID of the library or tape drive before you

can use the library. Review the manuals for the other devices on the SCSI bus or your operating

system to determine which SCSI IDs are currently in use.

 LUN Scanning: use dual LUNs to control the tape drive (LUN 0) and library robotic (LUN 1). These

models require an HBA that supports LUN scanning and LUN scanning must be enabled.

 SCSI Cabling: Verify that all SCSI cables are securely connected at both ends. Check the length

and integrity of your SCSI cabling. Check the SCSI connector for bent pins. The length of the

internal SCSI cabling inside the library is 2 feet (60 cm). This length must be included in any

calculations of cable length.

• For LVD SCSI the maximum length for a single device is 82 feet (25 meters). For multiple

devices, the maximum combined internal/external length is 40 feet (12 meters).

• If you have a combination of LVD and SE devices on the bus, the maximum cable length reverts

to the SE specification, which for Ultra devices is 10 feet (3 meters) for four or fewer devices,

and 5 feet (1.5 meters) for more than four devices.

 Termination: If the library is the only SCSI device — other than the SCSI host adapter — on the

selected SCSI bus, it must be terminated. Likewise, if the library is physically the last SCSI device

on the SCSI bus, it must be terminated. Only the devices physically located at the beginning and

end of the SCSI bus should be terminated. Refer to the manuals supplied with other devices on the

SCSI bus for information on enabling or disabling termination on those devices.

• To terminate the library, locate the terminator in the accessories package and press it firmly into

either of the two SCSI connectors on the back panel of the library. Secure the terminator by

tightening the finger-screws until snug. The supplied terminator is “dual mode” and will work on

both Low-Voltage Differential (LVD) and Single Ended (SE) SCSI buses. Check all SCSI and

power connections and confirm that the unit is attached to a valid SCSI SE or LVDS bus.

Compatibility: Ensure that the library is compatible with the SCSI host adapter and backup

application you plan to use. For a list of compatible SCSI adapters and application software, check with

your SCSI host adapter manufacturer or backup application vendor.

NOTE:

The host bus adapter for the library should be SCSI-3 LVDS. A single-ended SCSI host bus

adapter will severely degrade performance. Also, if there are any SE devices on the same SCSI

bus, the entire SCSI bus will negotiate down to SE speed and severely degrade performance.

 SCSI Host Adapter Installation: Verify that your SCSI host adapter is installed correctly. Refer to

the manual that came with your SCSI host adapter for installation and troubleshooting instructions.

Pay particular attention to any steps describing the settings of various jumpers and/or switches on

the host adapter, if applicable. Make sure that the host adapter is properly seated in the

motherboard slot and the operating system correctly detects the host adapter. Make sure that the

proper device driver is installed for the SCSI host adapter.

 Backup Application Installation: Refer to the documentation included with your backup

application for instructions on how to verify proper installation. Some backup software packages

require an additional module to communicate with the library robotics.

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