Administrator’s Command Line Guide

4.1. Monitoring General Storage Cluster Parameters
Parameter Description
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 Understanding Disk Space Usage on page 46
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 config-
ured 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 Key Authentication server and
license state.
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.
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