== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:30:12 (1741631412)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18912     1268776   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24480     1263208   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      545904     3061116  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      530680     3076340  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076584     6137456  15% /mnt/lustre