== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:00:06 (1787065206)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19172     1252132   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12576     1258728   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21048     3585972   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23524     3583496   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44572     7169468   1%  /mnt/lustre