== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 12:32:12 (1790958732)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17532     1253772   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9808     1261496   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28888     3578132   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14664     3592356   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre