== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 03:50:22 (1788940222)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17484     1253820   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9976     1261328   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30092     3576872   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13516     3593448   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170320   1%  /mnt/lustre