== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 06:25:07 (1778667907)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       12960     1258344   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17948     1253356   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22980     3584040   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20620     3586372   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170412   1%  /mnt/lustre