== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:49:13 (1789148953)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11740     1259564   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16244     1255060   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25768     3581112   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17816     3588952   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7170064   1%  /mnt/lustre