== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 11:45:55 (1722786355)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210560       22912     2185600   2% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       29696     3739648   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       27648     3741696   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       57344     7481344   1% /mnt/lustre