Dell Emulex Family of Adapters - Manual (Page 830)

Emulex Drivers Version 10.2 for Linux User Manual P010081-01A Rev. A
3. Configuration
FC and FCoE Driver Configuration
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driver parameters. All scsi_hosts bound to the FC and FCoE driver can be viewed with
the following command:
ls -d /sys/bus/pci/drivers/lpfc/*/host*
Assuming you are interested in adapter scsi_host 7, you can list the FC and FCoE driver
parameters for this particular adapter as:
ls -l /sys/class/scsi_host/host7/lpfc*
An example output follows:
-r--r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_ack0
-r--r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_fcp_class
-rw-r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/
lpfc_fdmi_on
-r--r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_link_speed
-rw-r--r-- 1 root root 4096 Feb 28 15:34 /sys/class/scsi_host/host7/lpfc_log_verbose
-r--r--r-- 1 root root 4096 Feb 28 17:03
/sys/class/scsi_host/host7/lpfc_lun_queue_depth
-rw-r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_max_luns
-rw-r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_nodev_tmo
-rw-r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_scan_down
-r--r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_topology
-rw-r--r-- 1 root root 4096 Feb 28 17:03 /sys/class/scsi_host/host7/lpfc_use_adisc
Temporary Configuring Parameters with sysfs
In the previous example, notice that the FC and FCoE driver parameters are available
as files. Reading a file displays the current value of a driver parameter. If the
permissions allow it, you can write a value to the file and it will take effect
immediately.
Reading the lpfc_log_verbose file may show that its value is “0”:
cat /sys/class/scsi_host/host7/lpfc_log_verbose
0
To modify the lpfc_log_verbose value to 0xffffffff:
echo 0xffffffff > /sys/class/scsi_host/host7/lpfc_log_verbose
Reading the lpfc_log_verbose file now shows a value of 0x ffffffff :
cat /sys/class/scsi_host/host7/lpfc_log_verbose
0xffffffff
Note: Setting the lpfc_log_verbose value to 0xffffffff may cause the system to
experience performance degradation.
Creating a New Ramdisk Image
The lpfc-install script creates a ramdisk image containing the FC and FCoE driver for
the currently running kernel.
Note: You must create a new ramdisk image whenever the LPFC options in
/etc/modprobe.conf are changed and you want the change to take effect on the
next reboot.