== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 21:20:08 (1787880008)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17212     1254092   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9684     1261620   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26940     3579940   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16672     3590264   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43612     7170204   1%  /mnt/lustre