== sanity test 56Dc: test 'lfs df -o' only shows OST devices ========================================================== 01:23:29 (1789277009)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       10856     1260448   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15828     1255476   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30852     3576028   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12752     3594128   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170156   1% /mnt/lustre