== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:51:59 (1788943919)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17424     1253880   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9588     1261716   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28192     3578436   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15392     3591516   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169952   1%  /mnt/lustre