== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 20:42:11 (1788914531)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15484     1255820   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18940     1252364   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32796     3574196   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11832     3595160   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44628     7169356   1% /mnt/lustre