This server (dumps) seems to be suffering high load average issues related to rsync jobs or nfs.
On 2018-10-02 we got paged by icinga about the load issue:
I jumped into the machine and rsyncd was the most CPU intensive process (about 100%) in both htop and iotop.
But probably the load is also high because NFS.
Apparently labstore1006 is not suffering the same issues.