== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:58:55 (1787615935)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2209664       13952     2193664   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2210048       12160     2195840   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       33792     3731456   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       16384     3745792   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7477248   1% /mnt/lustre