HP StorageWorks 2000 Series Reference Manual page 185

Making a configuration or cabling change on a host might cause the storage system
to stop accepting I/O requests from that host. For example, this problem can occur
after moving host cables from one HBA to another on the host. To fix such a
problem you might need to reset controller host ports (channels). For a Fibre
Channel host port configured to use FC-AL (loop) topology, a reset issues a loop
initialization primitive (LIP). For a SAS host port, a reset issues a
To reset a host port, as an Advanced Manage user:
1. Select Manage > Utilities > Host Utilities > Reset Host Channel.
2. Select the controller and host port.
3. Click Reset Host Channel.
sequence.