== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:14:26 (1783077266)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23612     1247692   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17640     1253664   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23080     3583940   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22512     3584508   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45592     7168448   1%  /mnt/lustre