== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:48:29 (1784087309)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18308     1252996   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       21472     1249832   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22504     3584516   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22280     3584740   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44784     7169256   1%  /mnt/lustre