<html> <head> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 10 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hi I am struggling to get some help on following configuration. This setup is intended to put live in a data center for 24 x 7 x365, any issue that makes my environment unstable is very critical here. My HA Cluster Setup details <ol start=1 type=1> <li class=MsoNormal>HP DL 360 G4p Server 2nos.</li> <li class=MsoNormal>HP MSA 500 G2 (SAN) 1nos.</li> <li class=MsoNormal>RedHat Enterprise Linux 4 ES </li> <li class=MsoNormal>Red Hat Cluster Suite 4</li> </ol> Server does have a HP SCSI HBA. MSA 500G2 is a scsi based SAN. Both of these server are connected to SAN using SCSI VHDCI cable. I used a network switch to establish network connectivity for the server. created a disk array of three HDD on SAN with two logical volumes than I have installed RHEL 4 Update 1 on both server(Servers are configured with RAID 1) than installed all HP drivers and management agents. After server configuration and OS installation I have installed Red Hat Cluster Suite v 4 on both the machine. Than I have configured Cluster using Cluster Configuration Manager. Added member hosts, configured fence device and assigned to member host(HP iLO is certified as an fence device), Configured Failover domain with node priority, configured resources such as floating IP address, File System, Script, than configured service which need to be run in HA mode. After configuring this I have tested with various scenario HA is working properly, when ever powered off any machine , services fail over on available node. Problem: If network goes off on node1, and service which were not running on node1 are started by node1 with shared storage mount point, which was already running on node 2 but both of these nodes are not able to communicate to each other, node2 anyway already running the same service with shared storage mount point. Because of Fencing both of these nodes try to kill each other. Both of they got hanged up at “Stoping Cluster manager Services…”.In /var/log/messages, it shows fencing s1, fence successful. If we disable fencing than If network comes back nodes don’t synchronize with each other. Shared storage mount point is available to both the servers. If they try to access storage at same storage gives IO errors. Hence this entire setup become very unstable, fragile. With Regard Deval Progression Infonet Pvt. Ltd. 55, Independent Electronic Modules, Sector - 18, Electronic City, Gurgaon – 122015 India Tel : - 0124 - 2455070, Ext. 215, Fax: 91-124-2398647 Mobile : - 98186 -82509 URL : - www.progression.com </div> </body> </html> <pre> =========================================================== Privileged or confidential information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), please delete this message and kindly notify the sender by an emailed reply. Opinions, conclusions and other information in this message that do not relate to the official business of Progression and its associate entities shall be understood as neither given nor endorsed by them. ------------------------------------------------------------- Progression Infonet Private Limited, Gurgaon (Haryana), India </pre>