ALTER CLUSTER

Overview

Modifies an Xpand deployment, adding and removing Xpand Nodes, adding and removing zones, resizing devices, configuring the number of replicas Xpand maintains of slices.

When using the Xpand Storage Engine topology, the details described here only apply when you connect to the Xpand nodes.

DETAILS

This statement allows you to modify the Xpand deployment, such as adding and removing nodes, resizing devices, and grouping nodes into zones.

ALTER CLUSTER supports the following statements:

Statement

Description

ALTER CLUSTER ADD

Performs a group change to add Xpand Nodes to a deployment

ALTER CLUSTER DROP

Performs a group change to remove Xpand Nodes from a deployment, without rebalancing to protect data.

ALTER CLUSTER REFORM

Performs a group change to reform the deployment.

ALTER CLUSTER RESIZE DEVICES

Performs a group change to resize device1 database files on each Xpand Node.

ALTER CLUSTER SET MAX_FAILURES

Sets the MAX_FAILURES option, specifying the minimum number of Xpand Nodes or zones that can simultaneously fail without data loss, and sets the Rebalancer to create sufficient acceptors and replicas to support this configuration.

ALTER CLUSTER SOFTFAIL

Marks the given Xpand Nodes for softfail, causing the Rebalancer to move data of the node so that it can safely be removed.

ALTER CLUSTER UNSOFTFAIL

Cancels a running softfail operation, restoring the Xpand Node to its previous configuration.

ALTER CLUSTER ZONE

Groups Xpand Nodes into arbitrary zones to improve fault tolerance.