Add more disk to the brokers

To add more disk space to your brokers, you have to modify the storageConfigs section of the KafkaCluster custom resource.

1. To retrieve the current configuration of a running Kafka cluster, run the following command:

   kubectl get kafkaclusters kafka -n kafka -o yaml > /tmp/kafkacluster.yaml
   

2. In the default installation, the storageConfigs section of the KafkaCluster custom resource is similar to the following:

       storageConfigs:
           - mountPath: "/kafka-logs"
           pvcSpec:
               accessModes:
               - ReadWriteOnce
               resources:
               requests:
                   storage: 10Gi
   

   The following example adds a new disk under the kafka-logs-1 mount path.

   Note: Adding new disks doesn’t automatically guarantee that Kafka starts using the new disks. Which disk is used depends on the keys of the messages stored in the partitions. If those are not evenly distributed, then Kafka will store more messages on one of the disks.

       storageConfigs:
           - mountPath: "/kafka-logs"
           pvcSpec:
               accessModes:
               - ReadWriteOnce
               resources:
               requests:
                   storage: 10Gi
           - mountPath: "/kafka-logs-1"
           pvcSpec:
               accessModes:
               - ReadWriteOnce
               resources:
               requests:
                   storage: 10Gi
   

3. Apply the modified CR to the cluster:

   kubectl apply -n kafka -f /tmp/kafkacluster-newdisk.yaml