How to rebalance disk and adapter instance(s) in Aria Operations

Products

• VMware Aria Suite

Issue/Introduction

After adding new node or replacing node, it will be necessary to rebalance disks across all cluster nodes.

After adding new node or replacing node, it's advisable to rebalance adapters across cluster nodes.

Environment

Aria Operations 8.x

Cause

After adding new analytics node or replacing node, disks usage will be unbalanced between the nodes. The process will start automatically after some time after new node is added. However, in some cases it's desired to start rebalance as soon as new node is added or replaced.

After adding new analytics node or replacing node, adapter instances may be unbalanced across the cluster, and it's recommended to spread the load amongst the collectors in the cluster.

Resolution

After successfully adding a new data node or replacing a node in Aria Operations you will need to:

• Ensure that all analytics nodes have equal amount of disk space for /storage/db filesystem. New nodes start with 250GB disks space for /storage/db, /storage/log, and /storage/core 
• You may be required to add additional storage, before rebalancing disks. Failure to verify and add disk space if required will result in cluster going down due to node out of storage.
• Rebalance the disk for all analytics nodes, follow the steps from the documentation: Cluster and Node Maintenance
• Rebalance all adapter instances equally across all analytics nodes, follow the steps from the documentation: Configuring Collector Groups

Note: Analytics nodes are: Primary, Primary replica, and data nodes.

Additional Information

Aria/vRealize Operations require that all Analytics nodes have close to the same amount of disk space. This is due to collected data being shared across the analytics nodes. If one node has less disk space available for /storage/db the cluster will go down when the node with the least amount of disk space will fill up before the nodes with more disk space available for the FSDB database.

The FSDB database will balance the data across all the analytics nodes in the cluster.

 

Issue command df -h in console or SSH session when logged in with root account, to determine how much disk space is required.