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Chapter 2. Scaling hyperconverged nodes
To scale HCI nodes up or down, the same principles and methods for scaling Compute nodes or Red Hat Ceph Storage nodes apply.
2.1. Scaling up hyperconverged nodes in HCI environments
To scale up hyperconverged nodes in HCI environments follow the same procedure for scaling up non-hyperconverged nodes. For more information, see Adding nodes to the overcloud.
When you tag new nodes, remember to use the right flavor.
For information about how to scale up HCI nodes by adding OSDs to a Red Hat Ceph Storage cluster, see Adding an OSD to a Ceph Storage node in Deploying an Overcloud with Containerized Red Hat Ceph.
2.2. Scaling down hyperconverged nodes in HCI environments
To scale down hyperconverged nodes in HCI environments you must rebalance the Ceph OSD services on the HCI node, migrate instances from the HCI nodes, and remove the Compute nodes from the overcloud.
Procedure
- Disable and rebalance the Ceph OSD services on the HCI node. This step is necessary because director does not automatically rebalance the Red Hat Ceph Storage cluster when you remove HCI or Red Hat Ceph Storage nodes.
- Migrate the instances from the HCI nodes. For more information, see Migrating virtual machines between Compute nodes in the Configuring the Compute Service for Instance Creation guide.
- Remove the Compute nodes from the overcloud. For more information, see Removing Compute nodes.
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