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Full Discussion: Linux: passing parameters to kernel modules
Homework and Emergencies Emergency UNIX and Linux Support Linux: passing parameters to kernel modules Post 302601610 by funksen on Friday 24th of February 2012 08:28:25 AM
Old 02-24-2012
Linux: passing parameters to kernel modules
Hi,

I need to set qlogic qla2xxx parameters in /etc/modprobe.conf
(Oracle Linux Server release 5.7, almost equal to RedHat 5.7)


two questions:
how can I pass this parameters to the module while it is loaded (fibre channel luns are in use), if possible at all

and how can I check the current used parameters by this module (modinfo shows me the possible values, but not the actual)

thanks in advance
cheers funksen

---------- Post updated at 14:28 ---------- Previous update was at 10:43 ----------

ok the second issue is solved I guess:

Code:
cd /sys/module/qla2xxx/parameters
# ls -l
total 0
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xallocfwdump
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xasynctmfenable
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xdbwr
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xdontresethba
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xenabledif
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xenablehba_err_chk
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xetsenable
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xextended_error_logging
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xfdmienable
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xfwloadbin
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xgffidenable
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xiidmaenable
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xloginretrycount
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xlogintimeout
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xmaxlun
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xmaxqdepth
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xmaxqueues
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xmdcapmask
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xmdenable
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xmultique_tag
-rw-r--r-- 1 root root 4096 Feb 24 11:10 ql2xplogiabsentdevice
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xshiftctondsd
-r--r--r-- 1 root root 4096 Feb 24 11:10 ql2xtargetreset
-r--r--r-- 1 root root 4096 Feb 24 11:10 qlport_down_retry

I set the parameter qlport_down_retry in /etc/modprobe.conf to 14

Code:
# cat qlport_down_retry
64

the whole system has been rebootet, but the new value is not being used by the module

in /etc/modprobe.conf:
Code:
options qla2xxx ql2xmaxqdepth=16 ql2xloginretrycount=30 qlport_down_retry=14

 

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LEARN ABOUT ULTRIX

systemd-volatile-root.service

SYSTEMD-VOLATILE-ROOT.SERVICE(8)			   systemd-volatile-root.service			  SYSTEMD-VOLATILE-ROOT.SERVICE(8)

NAME

       systemd-volatile-root.service, systemd-volatile-root - Make the root file system volatile

SYNOPSIS

       systemd-volatile-root.service

       /lib/systemd/systemd-volatile-root

DESCRIPTION

       systemd-volatile-root.service is a service that replaces the root directory with a volatile memory file system ("tmpfs"), mounting the
       original (non-volatile) /usr inside it read-only. This way, vendor data from /usr is available as usual, but all configuration data in
       /etc, all state data in /var and all other resources stored directly under the root directory are reset on boot and lost at shutdown,
       enabling fully stateless systems.

       This service is only enabled if full volatile mode is selected, for example by specifying "systemd.volatile=yes" on the kernel command
       line. This service runs only in the initial RAM disk ("initrd"), before the system transitions to the host's root directory. Note that this
       service is not used if "systemd.volatile=state" is used, as in that mode the root directory is non-volatile.

SEE ALSO

       systemd(1), systemd-fstab-generator(8), kernel-command-line(7)

systemd 237													  SYSTEMD-VOLATILE-ROOT.SERVICE(8)
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