Administrator’s Command Line Guide

4.3. Monitoring Chunk Servers
Cluster 'stor1': healthy
Space: [OK] allocatable 180GB of 200GB, free 1.6TB of 1.7TB
...
In this command output:
• 1.7TB is the total disk space in the stor1 cluster. The total disk space is calculated on the basis of used
and free disk space on all partitions in the cluster. Used disk space includes the space occupied by all
data chunks and their replicas plus the space occupied by any other files stored on the cluster
partitions.
Let us assume that you have a 100 GB partition and 20 GB on this partition are occupied by some files.
Now if you set up a chunk server on this partition, this will add 100 GB to the total disk space of the
cluster, though only 80 GB of this disk space will be free and available for storing data chunks.
• 1.6TB is the free disk space in the stor1 cluster. Free disk space is calculated by subtracting the disk
space occupied by data chunks and any other files on the cluster partitions from the total disk space.
For example, if the amount of free disk space is 1.6 TB and the total disk space is 1.7 TB, this means that
about 100 GB on the cluster partitions are already occupied by some files.
• allocatable 180GB of 200GB is the amount of free disk space that can used for storing data chunks. See
Understanding allocatable disk space below for details.
4.3.1.1 Understanding Allocatable Disk Space
When monitoring disk space information in the cluster, you also need to pay attention to the space reported
by the vstorage top utility as allocatable. Allocatable space is the amount of disk space that is free and can be
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