[lustre-discuss] Question regarding of lfs df values

Scott Wood woodystrash at hotmail.com
Sat Aug 3 14:55:23 PDT 2019

Hi folks,

We're in the process of draining and replacing all of our OSTs. After  "lfs find /mnt/lustre/ -obd bigvol-OST0020 | ./lfs_migrate -y 2>&1" completes, I do a final check to see if anything is in that OST with "lfs find /mnt/lustre/ -obd bigvol-OST0020" and it comes back with nothing so I expect the OST to be empty.  However an "lfs df" shows it still has over 300GB on it:

[root at hpcpbs01 lfs_migrate]# lfs df
UUID                       bytes        Used   Available Use% Mounted on
bigvol-OST0020_UUID   30997543948   345261920 29089667964   1% /mnt/lustre[OST:32]
filesystem_summary:  3345012413904 1976188607492 1200167543136  62% /mnt/lustre

Also, looking at the filesystem_summary, if I subtract the "Used" from "1K-blocks", the number is much higher than "Available", to the tune of  157TB.

Are either of these findings easily explained?


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