== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:39:33 (1790786373)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13200     1258104   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18108     1253196   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28028     3578572   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15524     3591384   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7169956   1% /mnt/lustre