pstorage -c clustername top shows warning for the disk space :
Space: [Warning] allocatable 735GB of 5.3TB, free 15TB of 16TB
Warning is shown, in case the amount of allocatable free space reaches certain barrier :
- allocatable space is less than 1G
- allocatable space is less than 20% of total effective(allocatable) space in cluster
This amount of space is considered dangerous, as in case of a failure of some large Chunk Server, the cluster may not get enough space to perform the relocation of chunks, and the cluster will become degraded (with all write operations frozen).
Add more disk space to the cluster.