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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 http://sourceware.org/cluster/wiki/DRBD_Cookbook 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 http://www.gossamer-threads.com/lists/drbd/users/20467#20467 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 |
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