== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 17:03:43 (1763417023)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15828     1255476   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21240     1250064   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28168     3578852   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15384     3591636   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre