== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:36:49 (1789684609)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11776     1259528   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16464     1254840   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22976     3583932   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20620     3586036   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7169968   1% /mnt/lustre