== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 21:18:39 (1763345919)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210304       10368     2197888   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       21504     3747840   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       25600     3743744   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       47104     7491584   1%  /mnt/lustre