<html><body bgcolor="#FFFFFF"><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); ">On Jan 21, 2011, at 7:20 PM, Edward Morbius <<a href="mailto:dredmorbius@gmail.com">dredmorbius@gmail.com</a>> wrote:</span><br></div><div><br></div><div></div><blockquote type="cite"><div><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"><a href="mailto:rswwalker@gmail.com">rswwalker@gmail.com</a></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"><a href="mailto:dredmorbius@gmail.com">dredmorbius@gmail.com</a></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>
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<a href="mailto:CentOS@centos.org"><a href="mailto:CentOS@centos.or">CentOS@centos.or</a></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></div></div></div></blockquote><br><div>AFAIK the RDAC you have installed looks correct and the config also looks good.</div><div><br></div><div>Did you start the multipath service make a connection to each IP and do a 'multipath -ll' and see what shows up?</div><div><br></div><div>-Ross</div></body></html>