== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:44:21 (1744051461)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       21480     1266208   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19184     1268504   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27176     3579844   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16988     3590032   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44164     7169876   1% /mnt/lustre