== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 15:34:02 (1773689642)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2209152       19456     2187648   1%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      2209280       17792     2189440   1%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3771392       31744     3737600   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       25600     3743744   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       57344     7481344   1%  /mnt/lustre