== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:19:36 (1783567176)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18296     1253008   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       21920     1249384   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25508     3581512   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19360     3587660   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44868     7169172   1%  /mnt/lustre