== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:25:49 (1786487149)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       21784     1249520   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15408     1255896   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27172     3579848   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17404     3589616   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44576     7169464   1%  /mnt/lustre