== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 08:19:34 (1787401174)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17504     1253800   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9744     1261560   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30272     3576720   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13328     3593636   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170356   1%  /mnt/lustre