== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:01:43 (1788476503)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11608     1259696   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16384     1254920   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31128     3575752   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12480     3594316   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170068   1% /mnt/lustre