Hi Daniel,
Thanks for clarifying.
I'll have a look at dirfrag option.
Regards,
Webert Lima
Em sáb, 19 de mai de 2018 01:18, Daniel Baumann <daniel.baumann@xxxxxx> escreveu:
On 05/19/2018 01:13 AM, Webert de Souza Lima wrote:
> New question: will it make any difference in the balancing if instead of
> having the MAIL directory in the root of cephfs and the domains's
> subtrees inside it, I discard the parent dir and put all the subtress right in cephfs root?
the balancing between the MDS is influenced by which directories are
accessed, the currently accessed directory-trees are diveded between the
MDS's (also check the dirfrag option in the docs). assuming you have the
same access pattern, the "fragmentation" between the MDS's happens at
these "target-directories", so it doesn't matter if these directories
are further up or down in the same filesystem tree.
in the multi-MDS scenario where the MDS serving rank 0 fails, the
effects in the moment of the failure for any cephfs client accessing a
directory/file are the same (as described in an earlier mail),
regardless on which level the directory/file is within the filesystem.
Regards,
Daniel
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