If the host bus adapters (HBAs) on HP 9000 and HP Integrity servers go offline, this situation does not necessarily indicate that an error occurred.
For example, the HBA can log out from the system if there is no file open to the system through the HBA.
Typically, Fibre Channel HBAs are logged in and are online only when they are actively working. If no volume group is assigned to the HBA or if the volume group is not in use, the HBA logs out and is shown as offline.