[MooseFS-Users] Flood of messages "replication status: No space left"

[<ma...@me...>]

Hello!
I noticed that syslog is flooded with messages like below:

Jul  6 06:25:23 foo mfschunkserver[2448]: replicator: hdd_create status: No space left
Jul  6 06:25:23 foo mfschunkserver[2448]: message repeated 3 times: [ replicator: hdd_create status: No space left]
Jul  6 06:25:23 foo mfsmaster[2452]: (192.168.100.11:9422 -> 192.168.100.10:9422) chunk: 00000000000071BB replication status: No space left
Jul  6 06:25:23 foo mfsmaster[2452]: (192.168.100.11:9422 -> 192.168.100.10:9422) chunk: 0000000000002BBA replication status: No space left
Jul  6 06:25:23 foo mfsmaster[2452]: (192.168.100.11:9422 -> 192.168.100.10:9422) chunk: 0000000000004893 replication status: No space left
Jul  6 06:25:23 foo mfsmaster[2452]: (192.168.100.11:9422 -> 192.168.100.10:9422) chunk: 00000000000053A8 replication status: No space left

There is free space on filesystem. mfshdd has one line:
</var/lib/mfs/chunks    -5GiB

# df -Th /var//lib/mfs/
Filesystem                                  Type  Size  Used Avail Use% Mounted on
/dev/mapper/w2t--cl--a--00--vg-mfs--storage xfs    50G  108M   50G   1% /var/lib/mfs

# du -hs /var/lib/mfs/chunks
16K     /var/lib/mfs/chunks

mfsmaster is 3.0.94.
What can be a reason of this messages?

Marcin