== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:04:26 (1773659066)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210304       10752     2197504   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       28672     3740672   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       52224     7486464   1%  /mnt/lustre