== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:07:50 (1726121270)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       16624     1271064   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22828     1264860   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      538864     3068156  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      537656     3069364  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076520     6137520  15% /mnt/lustre