> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/galera-cluster/high-availability.md).

# High Availability

- [Monitoring MariaDB Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/monitoring-mariadb-galera-cluster.md): Definitive Galera Cluster monitoring: SHOW GLOBAL STATUS wsrep\_% variables, Primary quorum checks, wsrep\_local\_state\_comment, and flow control metrics.
- [Understanding Quorum, Monitoring, and Recovery](https://mariadb.com/docs/galera-cluster/high-availability/understanding-quorum-monitoring-and-recovery.md): Quorum in MariaDB Galera Cluster keeps the Primary Component active only when a majority of nodes can communicate, preventing split-brain inconsistencies and data divergence.
- [Recovering a Primary Component](https://mariadb.com/docs/galera-cluster/high-availability/recovering-a-primary-component.md): Failure detection and recovery in MariaDB Galera Cluster, covering the EVS protocol's evs.\* timeouts, single-node recovery, and Primary Component restoration after a full cluster outage.
- [Resetting the Quorum (Cluster Bootstrap)](https://mariadb.com/docs/galera-cluster/high-availability/resetting-the-quorum-cluster-bootstrap.md): Manually reset Quorum and bootstrap a new MariaDB Galera Cluster Primary Component after a majority failure, using the Safe-to-Bootstrap flag in grastate.dat to pick the right node.
- [Load Balancing](https://mariadb.com/docs/galera-cluster/high-availability/load-balancing.md): Load balancing for MariaDB Galera Cluster, covering the recommended MaxScale-based approach, the Galera Load Balancer, and read-write splitting strategies for distributing client traffic.
- [Load Balancing in MariaDB Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/load-balancing/load-balancing-in-mariadb-galera-cluster.md): Load balancing strategies for MariaDB Galera Cluster, with MariaDB MaxScale as the recommended database-aware proxy and guidance on read-write splitting versus round-robin connections.
- [Galera Load Balancer (glbd)](https://mariadb.com/docs/galera-cluster/high-availability/load-balancing/galera-load-balancer.md): Galera Load Balancer (glbd) is a deprecated multi-threaded TCP connection balancer for MariaDB Galera Cluster, retained for historical reference; new deployments should use MariaDB MaxScale.
- [State Snapshot Transfers (SSTs) in Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/state-snapshot-transfers-ssts-in-galera-cluster.md): State Snapshot Transfers (SSTs) in MariaDB Galera Cluster copy the full dataset from a donor node to a new or recovering joiner node, ensuring data consistency before the joiner joins replication.
- [Introduction to State Snapshot Transfers (SSTs)](https://mariadb.com/docs/galera-cluster/high-availability/state-snapshot-transfers-ssts-in-galera-cluster/introduction-to-state-snapshot-transfers-ssts.md): State Snapshot Transfers (SSTs) provision a joining Galera Cluster node with a full data copy from a donor, supported via logical (mysqldump) and physical (mariadb-backup) methods.
- [mariadb-backup SST Method](https://mariadb.com/docs/galera-cluster/high-availability/state-snapshot-transfers-ssts-in-galera-cluster/mariadb-backup-sst-method.md): Configure State Snapshot Transfers for Galera. Learn to use mariadb-backup for non-blocking data transfer when a new node joins a cluster.
- [Manual SST of Galera Cluster Node With mariadb-backup](https://mariadb.com/docs/galera-cluster/high-availability/state-snapshot-transfers-ssts-in-galera-cluster/manual-sst-of-galera-cluster-node-with-mariadb-backup.md): Perform a manual node provision. This guide details the steps to manually backup a donor and restore it to a joiner node in a Galera Cluster.
- [Rapid Node Recovery with IST and the GCache](https://mariadb.com/docs/galera-cluster/high-availability/rapid-node-recovery-with-ist-and-the-gcache.md): Incremental State Transfer (IST) recovers a Galera Cluster joiner by sending only missing write-sets from the donor's GCache, falling back to a full SST when conditions aren't met.
- [Using MariaDB Replication with MariaDB Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster.md): MariaDB Galera Cluster provides high availability with synchronous replication, while adding asynchronous replication boosts redundancy for disaster recovery or reporting.
- [Overview of Hybrid Replication](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster/overview-of-hybrid-replication.md): Hybrid replication combines synchronous MariaDB Galera Cluster with standard asynchronous MariaDB replication to feed external replicas for disaster recovery, analytics, or migration.
- [Using MariaDB Replication with MariaDB Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster/using-mariadb-replication-with-mariadb-galera-cluster-using-mariadb-replica.md): Combine standard MariaDB replication with MariaDB Galera Cluster, configuring a cluster node as a replication primary or replica via log\_slave\_updates and wsrep\_restart\_slave.
- [Configuring MariaDB Replication between MariaDB Galera Cluster and MariaDB Server](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster/configuring-mariadb-replication-between-mariadb-galera-cluster-and-mariadb.md): Configure asynchronous MariaDB replication from a Galera Cluster source to a MariaDB Server replica, including the cluster server\_id, log\_slave\_updates, and wsrep GTID-mode setup.
- [Configuring MariaDB Replication between Two MariaDB Galera Clusters](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster/configuring-mariadb-replication-between-two-mariadb-galera-clusters.md): Set up asynchronous MariaDB replication between two Galera Clusters, with per-cluster server\_id and wsrep\_gtid\_domain\_id values plus parallel-replication tuning on the destination.
- [Using MariaDB GTIDs with MariaDB Galera Cluster](https://mariadb.com/docs/galera-cluster/high-availability/using-mariadb-replication-with-mariadb-galera-cluster/using-mariadb-gtids-with-mariadb-galera-cluster.md): MariaDB Galera Cluster has partial GTID support via wsrep\_gtid\_mode, which associates write-sets with globally unique GTIDs that remain consistent across cluster nodes in most cases.