Several groups have converted their large Subversion repository to Git. The largest I
know about is KDE, and they ended up writing a new program
svntogit to do that.
The KDE Subversion repository is still accessible at
Other people have used their tool
Some people persevere with
git-svn, bundled with Git.
I was writing my own partly because of pathologies in in-house repos that choked everything I found, and partly because I have bigger plans.
Large Subversion repos
The Apache Software Foundation puts all projects into a single common repo. As of this writing, it has 1,783,493 revisions:
KDE used to be in Subversion, and small pieces stil live there (just localization at this point, I think). As of this writing, it has 1,482,977 revisions:
GCC is in Subversion, although I think they are trying to switch to Git. As of this writing, it has 245,564 revisions:
SourceForge still uses Subversion for project repos.
My Experiences With Subversion - this is really about a CVS -> Subversion conversion.