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Verifying the metadata involves loading the server's "repodata" directory and downloading at least "repomd.xml", the metadata index file. In the file there are the SHA checksums of the metadata archive files.
Because yum caches the repomd.xml file below /var/cache/yum, it can happen that switching mirrors leads to a mismatch between the cached copy and what is found on a mirror.
If it happens to you often, disable the mirrorlist and enable your favourite server.
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