On Wed, 21 Aug 2019 at 19:26, João Carlos Mendes Luís <jonny@corp.globo.com> wrote:

Hi,

    I'm preping a new backend for our mirror host, and just found that centos mirror could use a little help from hardlinking.  After running `hardlink -cvvn` on our copy of centos repo, I got these results:

Directories 774
Objects 220535
IFREG 219740
Comparisons 4839
Would link 903
Would save 2951557120

    This means that 903 files are exactly equal (ignoring metadata, like date, perms, etc), meaning that more than 2.9GB could be saved.  Hardly much in a 207GB repo, but a save anyway.  Also, this means that local file system cache would be optmized.


It might be but it also depends on what the files are. Could you give exactly what files are doing this.. it may be that the other data is very important for some reason and a hardlink won't be possible.

 

    Problem is, everytime I resync my mirror, these hardlinks are lost.  So the hardlink shall be done in the master repo.

    Is there anything that I'm not seeing that prevents this optimization?


    Regards,

        Jonny
globo.com
João Carlos Mendes Luís
Senior DevOps Engineer
jonny@corp.globo.com
+55-21-2483-6893
+55-21-99218-1222


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Stephen J Smoogen.