Multipath.conf configuration max

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Operating Systems Linux Red Hat Multipath.conf configuration max_fds Post 302604832 by Tommyk on Tuesday 6th of March 2012 05:29:05 AM

03-06-2012

Registered User

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 wondering if this value is correct. should it be higher or lower and what are the implications of setting this value either higher or lower?

my current defaults are as below:

Code:

defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        path_checker            readsector0
        rr_min_io               100
        max_fds                 8192
        rr_weight               priorities
        failback                0
        features                "fail_if_no_path"
        no_path_retry           5
}

and my devices specific settings are as follows:

Code:

devices {
        device {
        vendor                  "(HITACHI|HP)"
        product                 "OPEN-.*"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        path_checker            hp-sw
        path_selector           "round-robin 0"
        hardware_handler        "0"
        failback                0
        rr_weight               priorities
        no_path_retry           queue
}

If anyone has a good amount of experience on this and can provide any insight into any issues with this i would be grateful to hear it. The SAN disk it is attached to is an HP24000 disk array.

Cheers,
Tom

Tommyk

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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)