== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:47:55 (1781221675)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19544     1251760   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11736     1259568   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24888     3582132   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18692     3588104   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7170236   1%  /mnt/lustre