== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:54:49 (1781664889)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15452     1255852   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18964     1252340   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28616     3578404   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15960     3591060   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44576     7169464   1%  /mnt/lustre