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Pacemaker is an open-source high availability resource manager software used on computer clusters since 2004. Until about 2007, it was part of the Linux-HA project, then was split out to be its own project. [3] It implements several APIs for controlling resources, but its preferred API for this purpose is the Open Cluster Framework resource ...
The cluster suite is available in: Red Hat Enterprise Linux 2.1 March 26, 2002; 22 years ago () Red Hat Enterprise Linux 3.x, 4.x, 5.x - with supported Global File System (v1.x) as a filesystem [2] Red Hat Enterprise Linux 5 Red Hat Enterprise Linux 5.3 and later - with Global File System 2 [3]
Aspen Systems Inc - Aspen Cluster Management Environment (ACME) Borg, used at Google; Bright Cluster Manager, from Bright Computing; ClusterVisor, [2] from Advanced Clustering Technologies [3] CycleCloud, from Cycle Computing acquired By Microsoft; Komodor, Enterprise Kubernetes Management Platform; Dell/EMC - Remote Cluster Manager (RCM)
The project originated from a mailing list started in November 1997. Eventually Harald Milz wrote an odd sort of Linux-HA HOWTO. Unlike most HOWTOs, this was not about how to configure or use existing software, it was a collection of HA techniques which one could use if one were to write HA software for Linux.
DRBD is often deployed together with the Pacemaker or Heartbeat cluster resource managers, although it does integrate with other cluster management frameworks. [ 7 ] [ 8 ] [ 9 ] It integrates with virtualization solutions such as Xen , and may be used both below and on top of the Linux LVM stack.
The most common size for an HA cluster is a two-node cluster, since that is the minimum required to provide redundancy, but many clusters consist of many more, sometimes dozens of nodes. The attached diagram is a good overview of a classic HA cluster, with the caveat that it does not make any mention of quorum/witness functionality (see above).
Popular, modern hardware RAID controllers from LSI, Adaptec, HP, and Areca are also supported in ESOS, including install-time CLI tool integration for these adapters. Clustering and high-availability support is made possible by the Pacemaker and Corosync cluster software stack.
SCST is often combined with RAID, data deduplication and/or high-availability cluster software to augment its functionality. The SCST software stack is the basis software of many SAN systems. [ 2 ] Several world records have been set with SAN systems based on SCST.