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Re: Subversion limits?

From: <kmradke_at_rockwellcollins.com>
Date: Fri, 28 Sep 2012 09:51:47 -0500

> I manage a Subversion server that has the following configuration :
> - SVN 1.6.9
> - FSFS storage mode
> - Apache + mod_dav + subversion modules
> - Linux Suse Enterprise Edition 32-bit
> On this SVN server, there are around 1100 SVN repositories for
> around 2000 users. I have small repositories and also very heavy
> repositories (the heaviest weighs around 33 GB on my linux
> filesystem). The sum of my repositories weighs around 1TB.
> Do you know if there is a size limitation for a SVN repository in
> Do you know if there is a number limitation for SVN repositories on
> a Subversion server? Does-it really decrease performances on the
> subversion server?

This really depends upon the hardware and how the users are using
the server. That said, the largest server I have has 1800
repositories serving around 6500 users. The largest repository
is around 400GB with around 7TB of total storage. The largest
single commit I have seen is around 53GB.

The larger repositories get, the longer it may take to do
maintenance activities such as verifying, filtering, dumping,
and loading a repository. This is why I'd recommend staying
away from large repositories and large commits, but they do work.

Subversion seems to be I/O bound, even on a high-end SAN. 1.7
seems to definitely chew more CPU and memory though. But, I've
also seen multiple 1GB NICs near saturation on the server too...

Things that can kill performance:
- Slow filesystem I/O
- Poorly written hook scripts
- Commits with large numbers of files (1M+)
- Lots of files locked (hundred of thousands+)
- Slow authentication servers

You could easily run into issues depending upon the filesystem
type and how you have organized the repositories. For example,
one large partition *might* be less efficient.

Kevin R.
Received on 2012-09-28 16:52:36 CEST

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