== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 00:54:47 (1787806487)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17256     1254048   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9704     1261600   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25868     3581068   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17740     3589224   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170292   1%  /mnt/lustre