CentOS 6.4: Warning! Received An Indication That The LUN Assignments On This Target Have Changed. The Linux SCSI Layer Does Not Automatically Remap LUN Assignments.

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~> uname -srvmpio Linux 2.6.32-358.18.1.el6.x86_64 #1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
~> rpm -qa kernel\* | sort kernel-2.6.32-358.18.1.el6.x86_64
kernel-2.6.32-358.el6.x86_64
kernel-devel-2.6.32-358.18.1.el6.x86_64
kernel-devel-2.6.32-358.el6.x86_64
kernel-firmware-2.6.32-358.18.1.el6.noarch kernel-headers-2.6.32-358.18.1.el6.x86_64

My department has several dozen servers using CentOS 6.4 connected to a HP P2000 G3 FC SAN via a Brocade switch. device-mapper-multipath is used to handle the multiple paths to the SAN storage. Our setup has two paths per two redundant controllers/switches.

~> rpm -qa device-mapper\* | sort device-mapper-1.02.77-9.el6.x86_64
device-mapper-event-1.02.77-9.el6.x86_64
device-mapper-event-libs-1.02.77-9.el6.x86_64
device-mapper-libs-1.02.77-9.el6.x86_64
device-mapper-multipath-0.4.9-64.el6_4.2.x86_64
device-mapper-multipath-libs-0.4.9-64.el6_4.2.x86_64
device-mapper-persistent-data-0.1.4-1.el6.x86_64

~> sudo cat /etc/multipath.conf multipaths {
multipath {
wwid
alias
}
}

defaults {
find_multipaths yes user_friendly_names yes
}

~> sudo multipath -ll
() dm-1 HP,P2000G3 FC/iSCSI
size=1.3T features=’1 queue_if_no_path’ hwhandler=’0′ wp=rw
|-+- policy=’round-robin 0′ prio0 status

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