[dm-devel] multipath.conf aliases
Virgilio, Vincent
Vincent.Virgilio at itt.com
Thu Oct 28 18:22:53 UTC 2004
> -----Original Message-----
> From: dm-devel-bounces at redhat.com
> [mailto:dm-devel-bounces at redhat.com] On Behalf Of Virgilio, Vincent
> Sent: Thursday, October 28, 2004 1:18 PM
> To: dm-devel at redhat.com
> Subject: [dm-devel] multipath.conf aliases
>
>
>
> Hello,
>
> I have just successfully configured most of Multipath on my system,
> which is:
>
> Fedora Core 3 Test 3
> kernel 2.6.10-rc1, with latest udm patches (not kgdb)
> multipath v0.3.5
>
> This CPU hosts a Qlogic 2200, which is attached to a Brocade Silkworm
> 2400 via one fiber. There is one target storage enclosure attached to
> the same Brocade via two controllers/fibers. The storage enclosure
> advertises the same 3 LUNs through each of those controllers.
>
> Thus there are two paths from the CPU to each LUN. This is
> reflected in
> the output from /sbin/multipath -v 2 below.
>
> Now, I'd like to alias the LUN devices to something like /dev/lun0,
> /dev/lun1, and /dev/lun2. Currently I only have default device mapper
> devices (/dev/dm-*, 5 of them, which I don't understand yet).
>
> I tried to do this aliasing in /etc/multipath.conf, included
> below.
> ...
My apologies, I included the wrong multipath.conf. Here is the right
one:
#
# name : defaults
# desc : multipath-tools default settings
#
defaults {
#
# name : multipath_tool
# scope : multipathd
# desc : the tool in charge of configuring the multipath
device maps
# default : "/sbin/multipath -v 0 -S"
#
multipath_tool "/sbin/multipath -v 0 -S"
#
# name : udev_dir
# desc : directory where udev creates its device nodes
# default : /udev
#
udev_dir /dev
#
# name : polling_interval
# scope : multipathd
# desc : interval between two path checks in seconds
# default : 5
#
polling_interval 10
#
# name : default_selector
# scope : multipath
# desc : the default path selector algorithm to use
# these algorithms are offered by the kernel multipath
target
# values : round-robin
# default : round-robin
#
default_selector round-robin
#
# name : default_selector_args
# scope : multipath
# desc : the default path selector number of args
# for the selected path selector algorithm
# default : 0
#
default_selector_args 0
#
# name : default_path_grouping_policy
# scope : multipath
# desc : the default path grouping policy to apply to
unspecified
# multipaths
# default : multibus
#
default_path_grouping_policy multibus
#
# name : default_getuid_callout
# scope : multipath
# desc : the default program and args to callout to obtain a
unique
# path identifier. Absolute path required
# default : /sbin/scsi_id -g -u -s
#
default_getuid_callout "/sbin/scsi_id -g -u -s"
#
# name : default_prio_callout
# scope : multipath
# desc : the default program and args to callout to obtain a
path
# priority value. The ALUA bits in SPC-3 provide an
# exploitable prio value for example
# default : /bin/false
#
default_prio_callout "/bin/false"
}
#
# name : devnode_blacklist
# scope : multipath & multipathd
# desc : list of device names to discard as not multipath candidates
# default : cciss, fd, hd, md, dm, sr, scd, st, ram, raw, loop
#
devnode_blacklist {
devnode cciss
devnode fd
devnode hd
devnode md
devnode dm
devnode sr
devnode scd
devnode st
devnode ram
devnode raw
devnode loop
}
#
# name : multipaths
# scope : multipath & multipathd
# desc : list of multipaths finest-grained settings
#
multipaths {
#
# name : multipath
# scope : multipath & multipathd
# desc : container for settings that apply to one specific
multipath
#
multipath {
#
# name : wwid
# scope : multipath & multipathd
# desc : index of the container
#
wwid 20080e5000011b784
#
# name : alias
# scope : multipath
# desc : symbolic name for the multipath
#
alias lun0
#
# name : path_grouping_policy
# scope : multipath
# desc : path grouping policy to apply to this
multipath
# values : failover, multibus, group_by_serial
# default : failover
#
path_grouping_policy multibus
#
# name : path_checker
# scope : multipathd
# desc : path checking alorithm to use to check path
state
# values : readsector0, tur
# default : readsector0
#
# path_checker readsector0
#
# name : path_selector
# desc : the path selector algorithm to use for this
mpath
# these algo are offered by the kernel mpath
target
# values : round-robin
# default : round-robin
#
path_selector round-robin
#
# name : path_selector_args
# desc : the defined path selector number of args
# default : 0
#
# path_selector_args 0
}
multipath {
wwid 20080e5000111b784
alias lun1
}
multipath {
wwid 20080e5000211b784
alias lun2
}
}
#
# name : devices
# scope : multipath & multipathd
# desc : list of per storage controler settings
# overrides default settings (device_maps block)
# overriden by per multipath settings (multipaths block)
#
devices {
#
# name : device
# scope : multipath & multipathd
# desc : settings for this specific storage controler
#
device {
#
# name : vendor, product
# scope : multipath & multipathd
# desc : index for the block
#
vendor "MYLEX "
product "DACARMRB "
#
# name : path_grouping_policy
# scope : multipath
# desc : path grouping policy to apply to multipath
hosted
# by this storage controler
# values : failover = 1 path per priority group
# multibus = all valid paths in 1
priority
# group
# group_by_serial = 1 priority group per
detected
# serial number
# default : failover
#
path_grouping_policy multibus
#
# name : getuid_callout
# scope : multipath
# desc : the program and args to callout to obtain a
unique
# path identifier. Absolute path required
# default : /sbin/scsi_id -g -u -s
#
getuid_callout "/sbin/scsi_id -g -u -s"
#
# name : path_checker
# scope : multipathd
# desc : path checking alorithm to use to check path
state
# values : readsector0, tur
# default : readsector0
#
path_checker readsector0
#
# name : path_selector
# desc : the path selector algorithm to use for this
mpath
# these algo are offered by the kernel mpath
target
# values : round-robin
# default : round-robin
#
path_selector round-robin
}
}
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