== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:36:29 (1788953789)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13440     1257864   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18016     1253288   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25944     3580684   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17640     3589268   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169952   1% /mnt/lustre