Lustre: Verify OST df usage

df -h will only give a summary of the lustre free disk usage. Use lfs instead to get details on all the OSss and MDS.

[root@comp00 ~]$ df -h | grep lustre
172.20.0.4@tcp:/lustrewt
                      859G  1.8G  814G   1% /mnt/lustre

[root@comp00 ~]$ lfs df -h
UUID                       bytes        Used   Available Use% Mounted on
lustrewt-MDT0000_UUID      190.8G      459.8M      179.5G   0% /mnt/lustre[MDT:0]
lustrewt-OST0000_UUID      214.7G      459.4M      203.3G   0% /mnt/lustre[OST:0]
lustrewt-OST0001_UUID      214.7G      459.4M      203.3G   0% /mnt/lustre[OST:1]
lustrewt-OST0002_UUID      214.7G      459.4M      203.3G   0% /mnt/lustre[OST:2]
lustrewt-OST0003_UUID      214.7G      459.4M      203.3G   0% /mnt/lustre[OST:3]

filesystem summary:       858.6G        1.8G      813.2G   0% /mnt/lustre