Run the AIX Advanced Diagnostics using the Problem Determination Mode against the Fibre Channel Adapter.  While the test is running, you will be prompted to plug or unplug the fibre cable or the wrap plug to or from the connector on the fibre channel adapter.

# diag -Avd fcs<X

For AIX 5.x the Switch firmware should be at least at level 06.xx.xx (at the time of writing) Check the following Port settings:

• - Port Type: Generic (Gx) or Fabric (F)
• - Port Speed: Negotiate, 1Gb/s for IBM 6227 or 2Gb/s for the other HBA types
• - Check that the port is Online and not segmented
• - If Port Binding is used, update the bound WWN
• - If your Switch is Flexport capable, check that the port is activated by a license key (one key for 8 ports)

There are some known driver issues. Install the latest version of all filesets listed below:

(http://techsupport.services.ibm.com/server/fixes)

Commonly needed filesets:

• - devices.common.IBM.fc.rte
• - devices.common.IBM.fc.hba-api
• - devices.fcp.disk.rte
• - devices.fcp.disk.array.diag
• - devices.fcp.disk.array.rte
• - devices.fcp.tape.rte
• - devices.scsi.disk.rte

Device Drivers:

• - IBM FC 6227: devices.pci.df1000f7
• - IBM FC 6228: devices.pci.df1000f9
• - IBM FC 6239: devices.pci.df1080f9
• - IBM FC 5716: devices.pci.df1000fa

Consider updating the Fibre Channel Adapter, the System and Service Processor Microcode to the current levels.  The IBM pSeries Support Website includes installation instructions and the current microcode.

http://techsupport.services.ibm.com/server/mdownload

Check the PCI Adapter Placement. Refer to the PCI Adapter Placement Reference:

http://publib.boulder.ibm.com/infocenter/pseries/index.jsp?topic=/com.ibm.pseries.doc/hardware.htm

You should set the default value for the HBA's Link Initialisation protocol. AL is the setting for Arbitrated Loop and Switch.

# chdev -l 'fcs<Y' -a init_link='al' -P

Note: You need to know the relationship between the Fibre Channel SCSI I/O Controller Protocol Device fscsi<X and its parent fcs<Y. In the example bellow fcs0 is the parent of fscsi0 and fcs1 is the parent of fscsi1. But fcs3 is the parent of fscsi2 and fcs2 is the parent of fscsi3.

# lsdev -Ccdriver -F "parent name description" -H

parent name description

• fcs0 fscsi0 FC SCSI I/O Controller Protocol Device
• fcs1 fscsi1 FC SCSI I/O Controller Protocol Device
• fcs3 fscsi2 FC SCSI I/O Controller Protocol Device
• fcs2 fscsi3 FC SCSI I/O Controller Protocol Device

- Unconfigure the hdisks and the FC SCSI I/O Controller Protocol Device

# rmdev -Rdl fscsi<X

- Set the HBA to defined

# rmdev -Rl fcs<Y

- Reset the switchport

- Set the Link Initialization protocol to Arbitrated Loop and Switch

# chdev -l 'fcs0' -a init_link='al'

- Configure the HBA

# cfgmgr -vl fcs<Y