== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:28:17 (1789140497)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11332     1259972   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16152     1255152   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30788     3576232   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12776     3593824   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43564     7170056   1%  /mnt/lustre