<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Hi All , Just want mention one point. I am using Ext3 filesystem in below setup. Regards Jayesh Shinde On 03/15/2011 05:43 PM, jayesh.shinde wrote: <blockquote cite="mid:4D7F57DA.8060204@netcore.co.in" type="cite"> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> Hi All , I don't have SAN with me , so I want to build the 2 node DRBD active active for mysql & http resource ( i.e /dev/drbd2 & /dev/drbd3 in my case) with RHCS . I configured the require setup from <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://sourceware.org/cluster/wiki/DRBD_Cookbook">http://sourceware.org/cluster/wiki/DRBD_Cookbook</a> and from DRDB links. From last 1 week I am testing the same scenario in 2 XEN vms with kenel 2.6.18-128.el5xen , Every thing is working fine , like mysql and http services move from one server to other etc... But not working correctly when it get fence ( i.e when n/w fail on of the node). I am facing the split-brain problem. I search a lot in google and mailling list but don't found the proper correct solution and suggestion. For Fence testing I am doing following. ================================ 1) On node1 http service is running with /dev/drbd2 2) On node2 mysql service is runing with /dev/drbd3 At this movement the DRBD primary-primary status is working correctly. 3) Now On node2 When I stop n/w service manually by "service network stop" then within 3-5 sec. node2 get fence properly and mysql service get switch on node1 properly. 4) After fencing when node2 come up , then I am facing the DRBD split-brain issue with node1 and node2. My questions :-- ========== 1) Why DRBD Split brain is not coming when I reboot or shutdown or destroy the machine by xm command i.e "xm reboot <node1/node2>" OR xm shutdown <node1/node2> OR xm destroy <node/node2> 2) Why the DRBD split brain issue come at the time of fencing node only ? 3) Is the combination of DRBD active-active + RHCS is stable ? and workable solution Because one of the below mailling list I found it's workable solution <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.gossamer-threads.com/lists/drbd/users/20467#20467">http://www.gossamer-threads.com/lists/drbd/users/20467#20467</a> 4) In fencing Is there any extra setting require for such combination ? 5) Do I need to use any custom fencing logic ? 6) Any one using such "DRBD active-active + RHCS" setup in Live without split brain issue ? Please guide and suggest on the same. Regards Jayesh Shinde </blockquote> </body> </html>