== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 03:50:14 (1788940214)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17484     1253820   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9976     1261328   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30080     3576772   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13504     3593208   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169980   1%  /mnt/lustre