== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:45:44 (1769759144)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210304       10240     2198016   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       27648     3741696   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       51200     7487488   1%  /mnt/lustre