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Full Discussion: Multipath configuration not being detected
Operating Systems Linux Red Hat Multipath configuration not being detected Post 303032172 by anaigini45 on Wednesday 13th of March 2019 05:00:57 AM
Old 03-13-2019
Multipath configuration not being detected
Hi,

In a RHEL 5 box, I have just added new multipath configurations in /etc/multipath.conf :

Code:
blacklist_exceptions {
        wwid "360002ac0000000000000008e0001ee00"
        wwid "360002ac0000000000000008f0001ee00"
        wwid "360002ac000000000000000900001ee00"
        wwid "360002ac000000000000000910001ee00"
        wwid "360002ac000000000000000920001ee00"
        wwid "360002ac000000000000000930001ee00"
}

These were the steps I used prior to adding the entries above :

1) Scan for available hosts in system :

Code:
[root@csixdb1 ~]# ls /sys/class/fc_host
host3  host4
[root@csixdb1 ~]#

2) Run the following commands to scan the LUN

Code:
$ echo "- - -" > /sys/class/scsi_host/host3/scan

$ echo "- - -" > /sys/class/scsi_host/host4/scan

However, even after the service is started, I am not getting any output from the commands multipath, multipath -v2 nor multipath -ll.

Code:
root@csixdb1 ~]# /etc/init.d/multipathd status
multipathd (pid  29995) is running...
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath -v2
[root@csixdb1 ~]#

Code:
[root@csixdb1 ~]# multipath -ll
[root@csixdb1 ~]#

Why is this? And how do I proceed from here?
 

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LEARN ABOUT CENTOS

mpathconf

MPATHCONF(8)						   Linux Administrator's Manual 					      MPATHCONF(8)

NAME

       mpathconf - A tool for configuring device-mapper-multipath

SYNOPSIS

       mpathconf [commands] [options]

DESCRIPTION

       mpathconf  is  a  utility  that	creates  or modifies /etc/multipath.conf.  It can enable or disable multipathing and configure some common
       options.  mpathconf can also load the dm_multipath module, start and stop the multipathd daemon, and configure the  multipathd  service	to
       start automatically or not. If mpathconf is called with no commands, it will display the current configuration.

       The  default  options  for mpathconf are --with_module The --with_multipathd option is not set by default.  Enabling multipathing will load
       the dm_multipath module but it will not immediately start it. This is so that users can manually  edit  their  config  file  if	necessary,
       before starting multipathd.

       If /etc/multipath.conf already exists, mpathconf will edit it. If it does not exist, mpathconf will use /usr/share/doc/device-mapper-multi-
       path-0.4.9/multipath.conf as the starting file. This file has user_friendly_names set. If this file does not exist, mpathconf  will  create
       /etc/multipath.conf  from  scratch.   For  most	users,	this  means  that  user_friendly_names will be set by default, unless they use the
       --user_friendly_names n command.

COMMANDS

       --enable
	      Removes any line that blacklists all device nodes from the /etc/multipath.conf blacklist section.

       --disable
	      Adds a line that blacklists all device nodes to the /etc/multipath.conf blacklist section. If no blacklist section exists,  it  will
	      create one.

       --user_friendly_name  { y | n }
	      If  set  to y, this adds the line user_friendly_names yes to the /etc/multipath.conf defaults section. If set to n, this removes the
	      line, if present. This command can be used along with any other command.

       --find_multipaths { y | n }
	      If set to y, this adds the line find_multipaths yes to the /etc/multipath.conf defaults section. If set to n, this removes the line,
	      if present. This command can be used aldong with any other command.

OPTIONS

       --with_module { y | n }
	      If  set  to  y,  this runs modprobe dm_multipath to install the multipath modules. This option only works with the --enable command.
	      This option is set to y by default.

       --with_multipathd { y | n }
	      If set to y, this runs service multipathd start to start the multipathd daemon on --enable, service multipathd stop to stop the mul-
	      tipathd  daemon on --disable, and service multipathd reload to reconfigure multipathd on --user_frindly_names and --find_multipaths.
	      This option is set to n by default.

FILES

       /etc/multipath.conf

SEE ALSO

       multipath.conf(5), modprobe(8), multipath(8), multipathd(8), service(8),

AUTHOR

       Benjamin Marzinski <bmarzins@redhat.com>

								     June 2010							      MPATHCONF(8)
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