== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 09:27:44 (1724765264)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       20680     1267008   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19148     1268540   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       36052     3570968   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16560     3590460   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       52612     7161428   1% /mnt/lustre