HP 2100 ER - Manual (Page 55)

Chapter 4 4-5
Troubleshooting Guide
Troubleshooting
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2. Make sure the libraries, Fibre Bridge, and hubs (DLT only) are
powered on and connected appropriately before powering on
workstations. If they were not connected, powered on, and configured
properly before the NT workstation was powered on, restart the
workstation (and any other on the loop, one at a time) so they can
re-discover the library.
NOTE (DLT Only) Do not restart multiple NT workstations on a Fibre Channel
loop at the same time. Allow each workstation to complete the process
and display the NT login prompt before turning on the next computer. If
more than one workstation is powered on at the same time, only one will
locate devices on the Fibre Channel loop. This sequential process is
particularly critical when recovering from a power failure.