Since I see the following entry at  /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.defaults<div>I am assuming I do not need to add it to multipath.conf but I do not know exaclty. Also my storage is Hitachi openv and the default one has Product name as &quot;DF.*&quot; as you can see below.</div>
<div><br></div><div>So I am confused in here.</div><div><br></div><div><br><div><br></div><div><div> device {</div><div>#               vendor                  &quot;HITACHI&quot;</div><div>#               product                 &quot;DF.*&quot;</div>
<div>#<span class="Apple-tab-span" style="white-space:pre">		</span>getuid_callout          &quot;/sbin/scsi_id -g -u -s /block/%n&quot;</div><div>#<span class="Apple-tab-span" style="white-space:pre">		</span>prio_callout<span class="Apple-tab-span" style="white-space:pre">		</span>&quot;/sbin/mpath_prio_hds_modular %d&quot;</div>
<div>#<span class="Apple-tab-span" style="white-space:pre">		</span>features<span class="Apple-tab-span" style="white-space:pre">		</span>&quot;0&quot;</div><div>#<span class="Apple-tab-span" style="white-space:pre">		</span>hardware_handler<span class="Apple-tab-span" style="white-space:pre">	</span>&quot;0&quot;</div>
<div>#<span class="Apple-tab-span" style="white-space:pre">		</span>path_grouping_policy<span class="Apple-tab-span" style="white-space:pre">	</span>group_by_prio</div><div>#<span class="Apple-tab-span" style="white-space:pre">		</span>failback<span class="Apple-tab-span" style="white-space:pre">		</span>immediate</div>
<div>#<span class="Apple-tab-span" style="white-space:pre">		</span>rr_weight<span class="Apple-tab-span" style="white-space:pre">		</span>uniform</div><div>#<span class="Apple-tab-span" style="white-space:pre">		</span>rr_min_io<span class="Apple-tab-span" style="white-space:pre">		</span>1000</div>
<div>#<span class="Apple-tab-span" style="white-space:pre">		</span>path_checker<span class="Apple-tab-span" style="white-space:pre">		</span>readsector0</div><div>#       }</div><div><br></div><div><br></div><div><br></div>
<div><br></div><div>Thanks</div><div>Paras.</div><div><br></div><br><div class="gmail_quote">On Fri, Jan 8, 2010 at 9:39 AM, Ray Van Dolson <span dir="ltr">&lt;<a href="mailto:rayvd@bludgeon.org">rayvd@bludgeon.org</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On Fri, Jan 08, 2010 at 09:37:25AM -0600, Paras pradhan wrote:<br>
&gt; Per,<br>
&gt;<br>
&gt; Yes I have a device mapper out of my detected LUNS. My storage is Hitachi<br>
&gt; OpenV . My multipath.conf files looks like below. Do I need to add anything<br>
&gt; to it since failover is not working. When I unplugg the cable in the 1st<br>
&gt; port of my HBA... my server reboots and I don&#39;t know what is causing this<br>
&gt; reboot. And after reboot when I plug the cable back, no recovery is done and<br>
&gt; to make it work I have to reboot the server once again with cable plugged.<br>
&gt;<br>
&gt; --<br>
&gt; blacklist {<br>
&gt; devnode &quot;^sda&quot;<br>
&gt; }<br>
&gt;<br>
&gt; defaults {<br>
&gt; user_friendly_names yes<br>
&gt; failback immediate<br>
&gt; }<br>
<br>
</div>Seems like you need a devices {} section to define how multipathd<br>
interacts with your storage, identifies problems and chooses a path to<br>
use...<br>
<font color="#888888"><br>
Ray<br>
</font><div><div></div><div class="h5">_______________________________________________<br>
CentOS mailing list<br>
<a href="mailto:CentOS@centos.org">CentOS@centos.org</a><br>
<a href="http://lists.centos.org/mailman/listinfo/centos" target="_blank">http://lists.centos.org/mailman/listinfo/centos</a><br>
</div></div></blockquote></div><br></div></div>