Scsi devices/Tape drives attached through a QLogic HBA not seen and in syslogs the message seen is "kernel: qla2xxx 0000:01:08.0: SNS scan failed -- assuming zero-entry result"

Issue

• Scsi devices/Tape drives attached through a QLogic HBA not seen and in syslogs the message seen are kernel: qla2xxx 0000:01:08.0: SNS scan failed -- assuming zero-entry result.
• 3 tape drives connected to the QLogic HBA are not being recognized. WWN zoning is configured on the switch, yet the drives cannot be seen.
  Entries of interest in /var/log/messages are:

Feb 5 16:39:15 hostname kernel: QLogic Fibre Channel HBA Driver  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: Found an ISP2312, irq 193, iobase 0xf8806000  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: Configuring PCI space...  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: Configure NVRAM parameters...  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: Verifying loaded RISC code...  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: Allocated (412 KB) for firmware dump...  
Feb 5 16:39:15 hostname kernel: scsi1 : qla2xxx  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0:  
Feb 5 16:39:15 hostname kernel: QLogic Fibre Channel HBA Driver: 8.03.00.1.05.05-k  
Feb 5 16:39:15 hostname kernel: QLogic QLA2340 - 133MHz PCI-X to 2Gb FC, Single Channel  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: LIP reset occured (f7f7).  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: LOOP UP detected (2 Gbps).  
Feb 5 16:39:15 hostname kernel: qla2xxx 0000:01:08.0: SNS scan failed -- assuming zero-entry result.