<br><br><div class="gmail_quote">On Fri, Jan 21, 2011 at 3:58 PM, Ross Walker <span dir="ltr"><<a href="mailto:rswwalker@gmail.com">rswwalker@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#FFFFFF"><div><div></div><div class="h5"><div><span>On Jan 21, 2011, at 6:41 PM, Edward Morbius <<a href="mailto:dredmorbius@gmail.com" target="_blank">dredmorbius@gmail.com</a>> wrote:</span><br></div>
<div><br></div><div></div><blockquote type="cite"><div>We've been wrestling with this for ... rather longer than I'd care to admit.<br><br>Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes.  Storage arrays / targets are Dell MD3220i storage arrays.<br>

<br>...<br></div></blockquote></div></div><div><br></div><div>Once this is installed you need to setup dm-multipath, look for multipathd.conf in /etc, get the product id and vendor id from dmesg after making an initial connection via open-iscsi and use that in the mutipath config. Your going to need to use path utility 'rdac' in the config instead of tur.</div>
<div><br></div><div>Google is your friend here.</div><div><br></div><font color="#888888"><div>-Ross</div><div><br></div></font></div><br>_______________________________________________<br>
CentOS mailing list<br>
<a href="mailto:CentOS@centos.org">CentOS@centos.or</a></blockquote><div><br>/etc/multipath.conf appears to be appropriately configured (we'd installed the MDSM host components):<br><br>------------------------------------------------------------------------<br>
         device {<br>                vendor                  "DELL"<br>                product                 "MD32xxi"<br>                path_grouping_policy    group_by_prio<br>                prio                    rdac<br>
                polling_interval        5<br>                path_checker            rdac<br>                path_selector           "round-robin 0"<br>                hardware_handler        "1 rdac"<br>
                failback                immediate<br>                features                "2 pg_init_retries 50"<br>                no_path_retry           30<br>                rr_min_io               100<br>
                prio_callout            "/sbin/mpath_prio_rdac /dev/%n"<br>        }<br>        device {<br>                vendor                  "DELL"<br>                product                 "MD32xx"<br>
                path_grouping_policy    group_by_prio<br>                prio                    rdac<br>                polling_interval        5<br>                path_checker            rdac<br>                path_selector           "round-robin 0"<br>
                hardware_handler        "1 rdac"<br>                failback                immediate<br>                features                "2 pg_init_retries 50"<br>                no_path_retry           30<br>
                rr_min_io               100<br>                prio_callout            "/sbin/mpath_prio_rdac /dev/%n"<br>        <br>        }<br>}<br>------------------------------------------------------------------------<br>
<br><br></div></div><br clear="all"><br>-- <br>Dr. Ed Morbius<br>Chief Scientist<br>Krell Power Systems Unlimited<br><br>