== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:48:43 (1733168923)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18692     1268996   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24688     1263000   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      539972     3067048  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      536628     3070392  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076600     6137440  15% /mnt/lustre