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Full Discussion: Multiple Paths to SAN with LVM in Linux?
Special Forums Hardware Filesystems, Disks and Memory Multiple Paths to SAN with LVM in Linux? Post 302131155 by deckard on Thursday 9th of August 2007 10:47:15 AM
Old 08-09-2007
Quote:
Originally Posted by thebap
...Running the controllers in active/active mode we're using RedHats Device Mapper Multipath software to create multiple paths to our SAN... I hope this helps you out a little...
Smilie It sure did! Since CentOS uses the 'yum' system some searching on the web and within the yum respositories led me to this:

Code:
[root@localhost etc]# yum install device-mapper-multipath
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for device-mapper-multipath to pack into transaction set.
device-mapper-multipath-0 100% |=========================| 9.5 kB    00:00     
---> Package device-mapper-multipath.i386 0:0.4.7-8.el5 set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size 
=============================================================================
Installing:
 device-mapper-multipath  i386       0.4.7-8.el5      base              760 k

Transaction Summary
=============================================================================
Install      1 Package(s)         
Update       0 Package(s)         
Remove       0 Package(s)         

Total download size: 760 k
Is this ok [y/N]: y
Downloading Packages:
(1/1): device-mapper-mult 100% |=========================| 760 kB    00:01     
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing: device-mapper-multipath      ######################### [1/1] 

Installed: device-mapper-multipath.i386 0:0.4.7-8.el5
Complete!

Now I just need to find a good HOWTO and give this a shot. Thanks a LOT!
 

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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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