What is no quorum policy?
1 Option no-quorum-policy. This global option defines what to do when the cluster does not have quorum (no majority of nodes is part of the partition). Allowed values are: ignore. The quorum state does not influence the cluster behavior at all, resource management is continued.
What is quorum policy?
A quorum policy is composed of one or more quorum policy rules. A quorum policy rule is composed of: Quorum Group: A set of members in the group that are needed to approve an operation. Administrator: Minimum number of administrators that need to approve the operation.
What is Pacemaker Corosync?
Corosync is an open source program that provides cluster membership and messaging capabilities, often referred to as the messaging layer, to client servers. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.
What is Suse Corosync?
Starting with SUSE Linux Enterprise High Availability Extension 12, Corosync can handle quorum for two-node clusters directly without changing the Pacemaker configuration. Corosync is a messaging and membership layer, see Section 6.2. 4, “Corosync Configuration for Two-Node Clusters” and Section 6.2.
Where would you check for issues with pacemaker configuration?
The main Pacemaker log file is /var/log/pacemaker/pacemaker. log . In case you cannot find the log files, check the logging settings in /etc/sysconfig/pacemaker , Pacemaker’s own configuration file.
How does a quorum work?
The Quorum is based on a voting algorithm. Each node in the cluster has a vote. The cluster keeps working while more than half of the voters are online. This is the quorum (or the majority of votes).
What is SBD pacemaker?
SBD (Storage-Based Death) allows Pacemaker to use a watchdog device to halt a node. While its name derives from using shared storage for coordination, only a watchdog is required — shared storage is optional. Pacemaker currently requires that SBD be configured on all nodes or none.
What is Pcsd in pacemaker?
PCS – Pacemaker/Corosync Configuration System. Pcs contains pcsd, a pcs daemon, which operates as a remote server for pcs and provides a web UI.
How do I start a crm cluster?
To add a new resource to the cluster, proceed as follows:
- Log in as root and start the crm tool: root # crm configure.
- Configure a primitive IP address:
- Display and review the changes you have made:
- Commit your changes to take effect:
What is cluster in SAP HANA?
To support high availability of your SAP system, your IT team can install SAP in a cluster environment. A cluster is a group of two or more connected servers that are configured with the same operating system, databases, and applications.
How do you check a pacemaker log?
Pacemaker writes its log files into the /var/log/pacemaker directory. The main Pacemaker log file is /var/log/pacemaker/pacemaker. log . In case you cannot find the log files, check the logging settings in /etc/sysconfig/pacemaker , Pacemaker’s own configuration file.
Can a cluster manage heartbeat, failover and Quorum?
The complexity of the heartbeat, failover and quorum management within the cluster is integrated inside the SafeKit product and transparent for users of SafeKit. Thus, people deploying SafeKit without specific skill can do it on two standard servers in any configuration, local or remote.
What is no quorum policy in SLES 11?
Setting no-quorum-policy to ignore makes the cluster behave like it has quorum. Resource management is continued. On SLES 11 this was the recommended setting for a two-node cluster. Starting with SLES 12, this option is obsolete. Based on configuration and conditions, Corosync gives cluster nodes or a single node “quorum” —or not.
How to set no quorum policy in HA cluster?
Use the LCMC to set “Stonith enabled” to “false” and “No Quorum Policy” to “ignore” since we are using resource-level fencing (see [2]) Click on Advanced in the Pacemaker configuration and set “start-failure-is-fatal” to false. This ensures that a failure in starting one single container does not move around all other containers.
Do you need a quorum server for safekit ha?
With the SafeKit HA software, the quorum within a Windows or Linux cluster requires no third quorum server, no quorum disk and no remote hardware reset. A simple split brain checker is sufficient for the SafeKit quorum to avoid the double execution of an application.
