== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 08:36:36 (1743510996)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       17468     1270220   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       14244     1273444   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      546124     3060896  16% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116      528636     3078384  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1074760     6139280  15% /mnt/lustre