== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 16:27:27 (1746131247)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210304       12288     2195968   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       21504     3747840   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       23552     3745792   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       45056     7493632   1% /mnt/lustre