== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:05:26 (1767326726)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       21452     1249852   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       17548     1253756   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       21024     3585996   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       23552     3583468   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44576     7169464   1%  /mnt/lustre