CentOS - Oct 2013 - 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.

All:

~> 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	 <redacted>
		alias <redacted>
	}
}

defaults {
	find_multipaths yes
	user_friendly_names yes
}

~> sudo multipath -ll
<redacted> (<redacted>) dm-1 HP,P2000G3 FC/iSCSI
size=1.3T features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=130 status=active
| |- 2:0:0:12 sdd 8:48 active ready running
| `- 1:0:0:12 sdb 8:16 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 1:0:1:12 sdc 8:32 active ready running
  `- 2:0:1:12 sde 8:64 active ready running

We're having a problem where syslog on every server connected to the SAN is
getting spammed with the following:

kernel: sd X:0:0:Y [sdX] Warning! Received an indication that the LUN
assignments on this target have changed. The Linux SCSI layer does not
automatically remap LUN assignments.

None of the LUN assignments of any of the volumes on the SAN have changed since
mapping them to the ports connected to each individual server.

So far my searches for a solution have turned up dead-ends and if anyone is able
to help, I'd greatly appreciate it.

Thanks,

Trevor T. Kates


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