User`s guide

102 Troubleshooting
Checking the Fibre Channel Link
At power up, the disk system and the host Fibre Channel I/O adapters default to
Fibre Channel Arbitrated Loop (FC-AL) Use the HP-UX FCMSUTIL on the host
to verify that the loop is operating correctly. Then check the Fibre Channel cables
and connectors.
To create the device files, first run the IOSCAN command against the Fibre
Channel driver to find the minor numbers. For example:
1 ioscan -fnd fcT1_cnt1
Output similar to the following will appear
Class I H/W Path Driver S/W State H/W Type Description
=========================================================================
lan 0 8/8.5fcT1_cntl CLAIMED INTERFACE HP Fibre Channel Mass Stora
/dev/fcms0
lan 1 8/12.5 fcT1_cntl CLAIMED INTERFACE HP Fibre Channel Mass Stora
/dev/fcms1
2 Next, run the LSDEV command to find the major number of the Fibre
Channel driver:
lsdev | grep fcT1_cntl
Output similar to the following will display. The major number is the first
item in the output line.
78 -1 fcT1_cntl lan
3 Next, run the MKNOD command to create the device files using the major
and minor numbers from the LSDEV and IOSCAN output. The minor
numbers are under the “I” column.
mknod /dev/fcms1 c 78 0x000000
mknod /dev/fcms1 c 78 0x010000
FCMSUTIL uses the device file of the Fibre Channel I/O adapters. If the
device files do not exist, they must be created.