If /etc/multipath.conf is modified after the multipathing service has been started, you must restart or reload the multipathing service for the modification to take effect. The following is an example: systemctl restart multipathd.service systemctl reload multipathd.service
On occasion you may come across where the array you have is not in the multipath.conf.defaults file, you can add a devices section, you may need to consult the manufactures documentation on what you may need in the multipath.conf file, below is an example of a HP OPEN-V series array.
Nov 29, 2007 · For example HP doesn’t support the Device Mapper Multipathing solution on their servers yet. Device Mapper Multipathing. Procedure for configuring the system with DM-Multipath: Install device-mapper-multipath rpm; Edit the multipath.conf configuration file: comment out the default blacklist; change any of the existing defaults as needed
Refer to the multipath.conf(5) man page for a description of find_multipaths. –with_module [y|n] – If set to y, this runs modprobe dm_multipath to install the multipath modules. This only works with the –enable command.
The multipath.conf file overrides the built-in configuration table for multipathd. Any line in the file whose first non-white-space character is # is considered a comment line. Empty lines are ignored. Example multipath.conf are available in the following locations:
Initialize the /etc/multipath.conf file: # mpathconf --enable; Edit /etc/multipath.conf and define defaults, blacklist, blacklist_exceptions, multipaths, and devices sections as required, for example:
/etc/multipath.conf is the configuration file for the multipath daemon. It is used to overwrite the built-in configuration table of multipathd . Any line whose first non-white- space character is a '#' is considered a comment line.