== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 09:27:42 (1724765262)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       20836     1266852   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19280     1268408   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       32940     3574080   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19632     3587388   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       52572     7161468   1% /mnt/lustre