== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:24:09 (1788607449)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19508     1251796   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11856     1259448   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20520     3586500   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23032     3583988   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre