> i svnsync gzrepos(centos 6.4-svn1.6.11) to gz-mirror1(centos 7-svn1.9.5),
> [...]
> mirror repo(gz-mirror1) is more less than source repo(gzrepos) in sizes 
> the source repo(gzrepos) is 177G while the mirror one(gz-mirror1)  is only 66G
> for example: revision:2012,it seems to be compressed

Possible reasons for differences in on-disk repository size:

* Target may use deduplication and intra-revision deduplication. (good)
* The user that performs the read part does not have complete repository read 
access
  Depending on what you are trying to do, this may be bad (as the sync is 
incomplete.

Andreas

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