== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 08:30:11 (1775046611)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210048       11008     2196992   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3735552   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       27648     3741696   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       51200     7477248   1%  /mnt/lustre