== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:42:44 (1730806964)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21260     1266428   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18808     1268880   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      545456     3061564  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      530092     3076928  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1075548     6138492  15% /mnt/lustre