== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:24:39 (1767327879)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23764     1247540   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20612     1250692   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30148     3576760   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15528     3591268   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45676     7168028   1%  /mnt/lustre