== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 13:16:29 (1774890989)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13808     1257496   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19284     1252020   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30764     3576256   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       12784     3594236   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43548     7170492   1%  /mnt/lustre