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RE: hot-backup vs svnadmin dump

From: Harvey, Edward <Edward.Harvey_at_patni.com>
Date: Sat, 5 Apr 2008 08:08:58 -0400

There's another advantage to svnsync -

Suppose you do a hotcopy at midnight capturing rev 100, and people do updates/commits during the day after, pushing the repo up to rev 101, and then somehow your repository server dies.

If you restore rev 100 of the repo to a new server, and then the clients with rev 101 try to connect to the restored repository of a lower rev number ... I'm not sure what will happen, but I know it's bad. To be safe, you'd have to blow away everyone's working copy and re-checkout for each person.

Svnsync can help you avoid this problem. If you keep a "live" synchronized backup of the repo, and then you need to make the "slave" into the "master," then your restored master is already up to 101, and peoples' clients are happy to continue where they left off.

Of course, whatever might have blown up your master repository would have a small chance of propagating to the slave repository too. So the best practice would be - Use chronic hotcopy in addition to a slave using svnsync. This gives you the most options available to you, if you should need to restore.

> -----Original Message-----
> From: Hyrum K. Wright [mailto:hyrum_wright_at_mail.utexas.edu]
> Sent: Friday, April 04, 2008 1:34 PM
> To: David Pratt
> Cc: users_at_subversion.tigris.org
> Subject: Re: hot-backup vs svnadmin dump
> David Pratt wrote:
> > Hi. I am in the process of automating a backup and recovery and would
> > like to know what is best for complete restoration of the repository.
> > The machines have different os's so just want to ensure I do not run
> > into snags.
> >
> > My repository is hosted on an mac osx machine. I would prefer to do
> > cron hot-backups and unarchive my repository without any consequences
> > to a CentOS machine in event of failure. Will I run into any trouble
> > with this scenario? Would it be better to do a dump and then load the
> > dump file to a new repository on the Linux box. I guess I am
> > questioning whether these method are os agnostic and if not how to
> work around this.
> > Many thanks.
> You could try using svnsync. It is cross-platform, and when included
> in a cron job, will automatically keep the backup up-to-date with the
> original, without having to worry about moving files between hosts.
> http://svnbook.red-
> bean.com/en/1.4/svn.reposadmin.maint.html#svn.reposadmin.maint.tk.svnsy
> nc
> -Hyrum

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Received on 2008-04-05 14:09:30 CEST

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