Today (Saturday) We will make some minor tuning adjustments to MySQL.

You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.

"Multipath configuration not being detected"

Post #303032172 by anaigini45 on Wednesday 13th of March 2019 05:00:57 AM

Multipath configuration not being detected


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

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 :

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

2) Run the following commands to scan the LUN

$ 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.

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

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

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

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

Why is this? And how do I proceed from here?
Related Linux and UNIX Technical Support
Multipath.conf configuration max_fds
Hi all, I am looking at the specific configuration settings for multipath.conf on RHEL5.5. In particular i was looking at the max_fds setting. Can anyone tell me the max number of open file descriptors that the RHEL5.5 system can have? It has been set previously to 8192, and i was...... Red Hat
Red Hat
Help with Multipath
Hi All, When I execute multipath -ll command that time display only 3 path (mpath1,mpath2 and mpath5), not display other 2 path (mpath3 and mpath4). I have configure 5 path in /etc/multipath.conf file. What is the reason behind it. Please help me. Please find below the output : ...... Red Hat
Red Hat
Cannot remove root Filesystem from the Multipath configuration
Hello all, I am running "Red Hat Enterprise Linux Server release 6.4 (Santiago)" The root Filesystem is currently part of the Multipath configuration and I need to remove it without rebooting the production Server. The wwid I want to remove from Multipathing is the last one i the list of...... Red Hat
Red Hat
Multipath address configuration in Solaris 10.
Hi all, I'm wondering if anyone knows whether Solaris IPMP can be configured such that the IPs of the physical NICs are not available to applications when using IP4 or if the group address and the underlying physical address are always present? Thanks.... Solaris
MPATHCONF(8)						   Linux Administrator's Manual 					      MPATHCONF(8)

mpathconf - A tool for configuring device-mapper-multipath
mpathconf [commands] [options]
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.
--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.
--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.
multipath.conf(5), modprobe(8), multipath(8), multipathd(8), service(8),
Benjamin Marzinski <> June 2010 MPATHCONF(8)

Featured Tech Videos