Get full DF output for all OSDs in a Ceph Cluster from Ceph itself.

ceph_osd_df.py

#!/usr/bin/env python

import json,sys
from subprocess import Popen, PIPE
from StringIO import StringIO

r = Popen(['ceph','report'],stdout=PIPE,stderr=PIPE)
cephreport, _ = r.communicate()

obj=json.load(StringIO(cephreport))

print "  OSD\t	Size\t	Used\t       Avail\t  Use%"
for OSD in obj['pgmap']['osd_stats']:
	outline="{0:5d}\t".format(OSD['osd'])
	for i in [ 'kb', 'kb_used', 'kb_avail' ]:
		outline+="{0:12d}\t".format(OSD[i])
	usep=float(OSD['kb_used'])/float(OSD['kb'])*100;
	print outline+"{0:6.2f}".format(usep)