== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:29:18 (1787398158)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17744     1253560   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10324     1260980   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29948     3576932   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13636     3593048   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169980   1%  /mnt/lustre