== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:59:48 (1788879588)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13608     1257696   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17976     1253328   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31320     3575672   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13308     3593600   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44628     7169272   1% /mnt/lustre