Parameter

Description

Cluster

Overall status of the cluster:

• healthy . All chunk servers in the cluster are active.
• unknown . There is not enough information about the cluster state (e.g., because the master MDS server was elected a while ago).
• degraded . Some of the chunk servers in the cluster are inactive.
• failure . The cluster has too many inactive chunk servers; the automatic replication is disabled.
• SMART warning . One or more physical disks attached to cluster Nodes are in pre-failure condition. For details, see Monitoring Physical Disks .

Space

Amount of disk space in the cluster:

• free . Free physical disk space in the cluster.
• allocatable . Amount of logical disk space available to clients. Allocatable disk space is calculated on the basis of the current replication parameters and free disk space on chunk servers. It may also be limited by license.

Note: For more information on monitoring and understanding disk space usage in clusters, see Monitoring Disk Space Usage .

MDS nodes

Number of active MDS servers as compared to the total number of MDS servers configured for the cluster.

epoch time

Time elapsed since the MDS master server election.

CS nodes

Number of active chunk servers as compared to the total number of chunk servers configured for the cluster.

The information in parentheses informs you of the number of

• Active chunk servers ( avail. ) that are currently up and running in the cluster.
• Inactive chunk servers ( inactive ) that are temporarily unavailable. A chunk server is marked as inactive during its first 5 minutes of inactivity.
• Offline chunk servers ( offline ) that have been inactive for more than 5 minutes. A chunk server changes its state to offline after 5 minutes of inactivity. Once the state is changed to offline, the cluster starts replicating data to restore the chunks that were stored on the offline chunk server.

License

Key number under which the license is registered on the Parallels Key Authentication server and license state.

For more information on licenses, see Managing Parallels Cloud Storage Licenses .

Replication

Replication settings. The normal number of chunk replicas and the limit after which a chunk gets blocked until recovered.

IO

Disks IO activity in the cluster:

• Speed of read and write I/O operations, in bytes per second.
• Number of read and write I/O operations per second.