root@ceph0:~# ceph health detail
HEALTH_WARN
mon.a addr 192.168.178.100:6789/0 has 28% avail disk space -- low disk space!
mon.b addr 192.168.178.101:6789/0 has 28% avail disk space -- low disk space!
root@ceph0:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       9.2G  6.1G  2.7G  70% /
udev            1.9G  4.0K  1.9G   1% /dev
tmpfs           766M  284K  766M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            1.9G     0  1.9G   0% /run/shm
/dev/sda3       453G  290G  163G  65% /var/lib/ceph/osd/ceph-0
/dev/sdb1       466G  277G  189G  60% /var/lib/ceph/osd/ceph-1
/dev/sdc1       466G  259G  207G  56% /var/lib/ceph/osd/ceph-2
/dev/sdd1       466G  277G  189G  60% /var/lib/ceph/osd/ceph-3
root@ceph0:~#