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Operating Systems Linux Red Hat 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?
Test Your Knowledge in Computers #536
Difficulty: Medium
The "null" keyword is only used to refer to uninitialized or missing data.
True or False?

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MULTIPATH(8)						   Linux Administrator's Manual 					      MULTIPATH(8)

multipath - Device mapper target autoconfig SYNOPSIS
multipath [-v verbosity] [-b bindings_file] [-d] [-h|-l|-ll|-f|-t|-F|-B|-c|-q|-r|-a|-A|-w|-W] [-p failover|multi- bus|group_by_serial|group_by_prio|group_by_node_name] [device] DESCRIPTION
multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them OPTIONS
-v level verbosity, print all paths and multipaths 0 no output 1 print the created or updated multipath names only, for use to feed other tools like kpartx 2 + print all info : detected paths, coalesced paths (ie multipaths) and device maps -h print usage text -d dry run, do not create or update devmaps -l show the current multipath topology from information fetched in sysfs and the device mapper -ll show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...) -f flush a multipath device map specified as parameter, if unused -F flush all unused multipath device maps -t print internal hardware table to stdout -r force devmap reload -B treat the bindings file as read only -b bindings_file set user_friendly_names bindings file location. The default is /etc/multipath/bindings -c check if a block device should be a path in a multipath device -q allow device tables with queue_if_no_path when multipathd is not running -a add the wwid for the specified device to the wwids file -A add wwids from any kernel command line mpath.wwid parameters to the wwids file -w remove the wwid for the specified device from the wwids file -W reset the wwids file to only include the current multipath devices -p policy force new maps to use the specified policy: failover 1 path per priority group multibus all paths in 1 priority group group_by_serial 1 priority group per serial group_by_prio 1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-con- troller or per-multipath option in the configuration file group_by_node_name 1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name. Existing maps are not modified. device update only the devmap the path pointed by device is in. device is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format. device may alternatively be a multipath mapname SEE ALSO
multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8) AUTHORS
multipath was developed by Christophe Varoqui, <> and others. July 2006 MULTIPATH(8)

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