== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:36:09 (1788266169)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19580     1251724   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9784     1261520   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31908     3574972   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11700     3595208   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170180   1% /mnt/lustre