== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:52:46 (1784127166)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       21204     1250100   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15424     1255880   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32816     3574120   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12364     3594600   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45180     7168720   1%  /mnt/lustre