6.7. 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:
vstorage -c <cluster_name> topcommand.
Press V to display additional information about the cluster. Typical command output may look like this:
# vstorage -c stor1 top Cluster 'stor1': healthy Space: [OK] allocatable 448.6GB of 492.0GB, free 1.39TB of 1.44TB MDS nodes: 3 of 3, epoch uptime: 20d 0h CS nodes: 3 of 3 (3 avail, 0 inactive, 0 offline) License: ACTIVE (expiration: 01/10/2021, capacity: 10TB, used: 20.3GB) Replication: 3 norm, 2 limit Chunks: [Warning] 187 (57%) healthy, 0 (0%) standby, 0 (0%) degraded, 135 (41%) urgent, 0 (0%) blocked, 0 (0%) pending, 0 (0%) offline, 1 (0%) replicating, 0 (0%) overcommitted, 0 (0%) deleting, 0 (0%) void IO: read 0B/s ( 0ops/s), write 106KB/s ( 7ops/s) ...
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%.
For more information on available chunk statuses, see Exploring Chunk States.