[lustre-discuss] Inode quota: limits on different MDTs

Thomas Roth t.roth at gsi.de
Sat Mar 6 10:55:33 PST 2021

Dear all,

a user has hit the inode quota limit:

      Filesystem    used   quota   limit   grace   files   quota   limit   grace
         /lustre  12.76T      0k      0k       -  635978* 636078  636178 2d16h29m43s

Typical quota mathematics: 635978 > 636178, but it's distributed quota, very well.

We have three MDTs, the user most probably has files and directories on only one of them.
Let's check "-v":

# lfs quota -h -v -u User /lustre
         /lustre  12.76T      0k      0k       -  635978* 636078  636178 2d16h29m43s
                      0k       -  15.28G       -       0       -       1       -
                  134.2M       -  16.04G       -  635978       -  636460       -
                      0k       -      0k       -       0       -   17150       -

What is the meaning of column #7 in the output for each MDT?

In the general result, it is the hard limit.

Here it is 1 on MDT0 - everything probably needs at least one inode on the root of the fs.
Seem the user's files are on MDT1, where the column reads  636460 - that is not what I set as the hard limit.
And on MDT2, the column reads 17150, but no files from the user there.
And the hard limit is also not the difference of these two values ;-)

Best regards,

Thomas Roth
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