Chapter 9. Clustering

Red Hat Enterprise Linux 6.4 adds support for the IBM iPDU fence device. For more information on the parameters of this fence device, refer to the Fence Device Parameters appendix in the Red Hat Enterprise Linux 6 Cluster Administration guide.

Red Hat Enterprise Linux 6.4 adds support for fence_eaton_snmp, the fence agent for the Eaton over SNMP network power switch. For more information on the parameters of this fence agent, refer to the Fence Device Parameters appendix in the Red Hat Enterprise Linux 6 Cluster Administration guide.

Red Hat Enterprise Linux 6.4 includes the keepalived package as a Technology Preview. The keepalived package provides simple and robust facilities for load-balancing and high-availability. The load-balancing framework relies on the well-known and widely used Linux Virtual Server kernel module providing Layer 4 network load-balancing. The keepalived daemon implements a set of health checkers for load-balanced server pools according to their state. The keepalived daemon also implements the Virtual Router Redundancy Protocol (VRRP), allowing router or director failover to achieve high availability.

New fence_sanlock and checkquorum.wdmd fence agents, included in Red Hat Enterprise Linux 6.4 as a Technology Preview, provide new mechanisms to trigger the recovery of a node via a watchdog device. Tutorials on how to enable this Technology Preview will be available at https://fedorahosted.org/cluster/wiki/HomePage.

Red Hat Enterprise Linux 6.4 adds support for clusters utilizing VMware's VMDK (Virtual Machine Disk) disk image technology with the multi-writer option. This allows you, for example, to use VMDK-based storage with the multi-writer option for clustered file systems such as GFS2.