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Remove a node
You can remove resources from a cluster when they are no longer needed. Three nodes are the minimum requirement. However to allow room for a node failure, four is the recommended minimum number of nodes in a cluster.
- Open a terminal, ssh into the node to be removed (node c44 in this example) and run the
# cioctl remove
This starts a process to remove metadata of the node from the rest of the cluster. It also starts a rebuild process to ensure redundancy of data in the rest of the cluster, as storage resources on the removed node are deleted.
- Run the
cio node lscommand and observe that the removed node is ‘leaving’ the cluster. The removed node stays in ‘leaving’ status until it’s metadata is completely erased.
# cio node ls NODENAME IP NODE_ID ROLE STATUS c41 192.168.1.41 a49d9ccc sds normal c42 192.168.1.42 c236e059 backup1 normal c43 192.168.1.43 06aa2eb7 backup2 normal c44 192.168.1.44 0808d8c0 standard leaving
- After a removed node is erased, the rebuilding process may still be running in the cluster,
# cio node ls NODENAME IP NODE_ID ROLE STATUS c41 192.168.1.41 a49d9ccc sds normal c42 192.168.1.42 c236e059 backup1 normal c43 192.168.1.43 06aa2eb7 backup2 normal