== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:22:14 (1762172534)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17256     1254048   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24164     1247140   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31668     3575352   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12956     3594064   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44624     7169416   1%  /mnt/lustre