Chapter 7. Scaling storage of Red Hat Virtualization OpenShift Data Foundation cluster To scale the storage capacity of your configured Red Hat OpenShift Data Foundation worker nodes on Red Hat Virtualization cluster, you can increase the capacity by adding three disks at a time. Three disks are needed since OpenShift Data Foundation uses a replica count of 3 to maintain the high availability. So the amount of storage consumed is three times the usable space. Note Usable space may vary when encryption is enabled or replica 2 pools are being used. 7.1. Scaling up storage capacity on a cluster To increase the storage capacity in a dynamically created storage cluster on an user-provisioned infrastructure, you can add storage capacity and performance to your configured Red Hat OpenShift Data Foundation worker nodes. Prerequisites You have administrative privilege to the OpenShift Container Platform Console. You have a running OpenShift Data Foundation Storage Cluster. The disk should be of the same size and type as used during initial deployment. Procedure Log in to the OpenShift Web Console. Click Operators Installed Operators . Click OpenShift Data Foundation Operator. Click the Storage Systems tab. Click the Action Menu (...) on the far right of the storage system name to extend the options menu. Select Add Capacity from the options menu. Select the Storage Class . Choose the storage class which you wish to use to provision new storage devices. Click Add . To check the status, navigate to Storage Data Foundation and verify that Storage System in the Status card has a green tick. Verification steps Verify the Raw Capacity card. In the OpenShift Web Console, click Storage Data Foundation . In the Status card of the Overview tab, click Storage System and then click the storage system link from the pop up that appears. In the Block and File tab, check the Raw Capacity card. Note that the capacity increases based on your selections. Note The raw capacity does not take replication into account and shows the full capacity. Verify that the new OSDs and their corresponding new Persistent Volume Claims (PVCs) are created. To view the state of the newly created OSDs: Click Workloads Pods from the OpenShift Web Console. Select openshift-storage from the Project drop-down list. Note If the Show default projects option is disabled, use the toggle button to list all the default projects. To view the state of the PVCs: Click Storage Persistent Volume Claims from the OpenShift Web Console. Select openshift-storage from the Project drop-down list. Note If the Show default projects option is disabled, use the toggle button to list all the default projects. Optional: If cluster-wide encryption is enabled on the cluster, verify that the new OSD devices are encrypted. Identify the nodes where the new OSD pods are running. <OSD-pod-name> Is the name of the OSD pod. For example: Example output: For each of the nodes identified in the step, do the following: Create a debug pod and open a chroot environment for the selected hosts. <node-name> Is the name of the node. Check for the crypt keyword beside the ocs-deviceset names. Important Cluster reduction is supported only with the Red Hat Support Team's assistance. 7.2. Scaling out storage capacity on a Red Hat Virtualization cluster OpenShift Data Foundation is highly scalable. It can be scaled out by adding new nodes with required storage and enough hardware resources in terms of CPU and RAM. Practically there is no limit on the number of nodes which can be added but from the support perspective 2000 nodes is the limit for OpenShift Data Foundation. Scaling out storage capacity can be broken down into two steps Adding new node Scaling up the storage capacity Note OpenShift Data Foundation does not support heterogeneous OSD/Disk sizes. 7.2.1. Adding a node to an installer-provisioned infrastructure Prerequisites You have administrative privilege to the OpenShift Container Platform Console. You have a running OpenShift Data Foundation Storage Cluster. Procedure Navigate to Compute Machine Sets . On the machine set where you want to add nodes, select Edit Machine Count . Add the amount of nodes, and click Save . Click Compute Nodes and confirm if the new node is in Ready state. Apply the OpenShift Data Foundation label to the new node. For the new node, click Action menu (...) Edit Labels . Add cluster.ocs.openshift.io/openshift-storage , and click Save . Note It is recommended to add 3 nodes, one each in different zones. You must add 3 nodes and perform this procedure for all of them. In case of bare metal installer-provisioned infrastructure deployment, expand the cluster first using the instructions that can be found here . Verification steps Execute the following command the terminal and verify that the new node is present in the output: On the OpenShift web console, click Workloads Pods , confirm that at least the following pods on the new node are in Running state: csi-cephfsplugin-* csi-rbdplugin-* 7.2.2. Adding a node using a local storage device You can add nodes to increase the storage capacity when existing worker nodes are already running at their maximum supported OSDs or when there are not enough resources to add new OSDs on the existing nodes. Add nodes in the multiple of 3, each of them in different failure domains. Though it is recommended to add nodes in multiples of 3 nodes, you have the flexibility to add one node at a time in flexible scaling deployment. See Knowledgebase article Verify if flexible scaling is enabled Note OpenShift Data Foundation does not support heterogeneous disk size and types. The new nodes to be added should have the disk of the same type and size which was used during initial OpenShift Data Foundation deployment. Prerequisites You have administrative privilege to the OpenShift Container Platform Console. You have a running OpenShift Data Foundation Storage Cluster. Procedure Depending on the type of infrastructure, perform the following steps: Get a new machine with the required infrastructure. See Platform requirements . Create a new OpenShift Container Platform worker node using the new machine. Check for certificate signing requests (CSRs) that are in Pending state. Approve all the required CSRs for the new node. <Certificate_Name> Is the name of the CSR. Click Compute Nodes , confirm if the new node is in Ready state. Apply the OpenShift Data Foundation label to the new node using any one of the following: From User interface For the new node, click Action Menu (...) Edit Labels . Add cluster.ocs.openshift.io/openshift-storage , and click Save . From Command line interface Apply the OpenShift Data Foundation label to the new node. <new_node_name> Is the name of the new node. Click Operators Installed Operators from the OpenShift Web Console. From the Project drop-down list, make sure to select the project where the Local Storage Operator is installed. Click Local Storage . Click the Local Volume Discovery tab. Beside the LocalVolumeDiscovery , click Action menu (...) Edit Local Volume Discovery . In the YAML, add the hostname of the new node in the values field under the node selector. Click Save . Click the Local Volume Sets tab. Beside the LocalVolumeSet , click Action menu (...) Edit Local Volume Set . In the YAML, add the hostname of the new node in the values field under the node selector . Figure 7.1. YAML showing the addition of new hostnames Click Save . Note It is recommended to add 3 nodes, one each in different zones. You must add 3 nodes and perform this procedure for all of them. Verification steps Execute the following command the terminal and verify that the new node is present in the output: On the OpenShift web console, click Workloads Pods , confirm that at least the following pods on the new node are in Running state: csi-cephfsplugin-* csi-rbdplugin-* 7.2.3. Scaling up storage capacity To scale up storage capacity: For dynamic storage devices, see Scaling up storage by adding capacity . For local storage devices, see Scaling up a cluster created using local storage devices

Commands:
oc get -n openshift-storage -o=custom-columns=NODE:.spec.nodeName pod/ <OSD-pod-name>
oc get -n openshift-storage -o=custom-columns=NODE:.spec.nodeName pod/rook-ceph-osd-0-544db49d7f-qrgqm
NODE compute-1
oc debug node/ <node-name>
chroot /host
lsblk
oc get nodes --show-labels | grep cluster.ocs.openshift.io/openshift-storage= |cut -d' ' -f1
oc get csr
oc adm certificate approve <Certificate_Name>
oc label node <new_node_name> cluster.ocs.openshift.io/openshift-storage=""
oc get nodes --show-labels | grep cluster.ocs.openshift.io/openshift-storage= |cut -d' ' -f1