== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 04:10:20 (1759824620)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       24568     1263120   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21748     1265940   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27044     3579948   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18400     3588536   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       45444     7168484   1% /mnt/lustre