5.7. Monitoring Replication Parameters¶

When you configure replication parameters, keep in mind that the new settings do not come into effect immediately. For example, increasing the default replication parameter for data chunks may take some time to complete, depending on the new value of this parameter and the number of data chunks in the cluster.

To check that the new replication parameters have been successfully applied to your cluster:

1. Run the vstorage -c <cluster_name> top command.

2. Press V to display additional information about the cluster. Your command output should look similar to the following:

   # vstorage -c stor1 top
   connected to MDS#1
   Cluster 'stor1': healthy
   Space: [OK] allocatable 200GB of 211GB, free 211GB of 211GB
   MDS nodes: 1 of 1, epoch uptime: 2h 21m
   CS nodes:  2 of 2 (2 avail, 0 inactive, 0 offline)
   License: PCSS.02444715.0000 is ACTIVE, 6399TB capacity
   Replication:  3 norm,  2 limit
   Chunks: [OK] 431 (100%) healthy,  0 (0%) degraded,  0 (0%) urgent,
                0 (0%) blocked,  0 (0%) offline,  0 (0%) replicating,
                0 (0%) overcommitted,  0 (0%) deleting,  0 (0%) void
   <...>
   

3. Check the Chunks field for the following:

   • When decreasing the replication parameters, look for chunks that are in the overcommitted or deleting state. If the replication process is complete, no chunks with these states should be present in the output.

   • When increasing the replication parameters, look for chunks that are in the blocked or urgent state. If the replication process is complete, no chunks with these states should be present in the output. Besides, when the process is still in progress, the value of the healthy parameter is less than 100%.

   Note

   For more information on available chunk statutes, see Exploring Chunk States.