== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:53:39 (1775782419)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       16096     1255208   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19392     1251912   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31156     3575864   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12444     3594576   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43600     7170440   1%  /mnt/lustre