== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:33:37 (1775212417)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13704     1257600   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19028     1252276   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27940     3578884   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15644     3591236   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43584     7170120   1%  /mnt/lustre