== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:01:27 (1789308087)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       16072     1255232   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20088     1251216   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30700     3576320   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13880     3593140   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44580     7169460   1% /mnt/lustre