== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:24:57 (1718853897)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210560       16000     2192512   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       30720     3738624   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       27648     3741696   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       58368     7480320   1% /mnt/lustre