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[Linux-cluster] Network failure make cluster Unstable


I struggling to get some help on following configuration, even logged a call with redhat support but didn’ t get any satisfactory reply.



My HA Cluster Setup details


  1. HP DL 360 G4p Server                       2nos.
  2. HP MSA 500 G2 (SAN)                     1nos.
  3. RedHat Enterprise Linux 4 ES 
  4. Red Hat Cluster Suite 4


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.




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. If network comes back nodes don’t synchronize with each other .Hence this entire setup become unstable.





With Regard


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