== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:46:57 (1763354817)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17028     1254276   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24036     1247268   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29232     3577788   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15380     3591640   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44612     7169428   1%  /mnt/lustre