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From Nico Kadel-Garcia <nka...@gmail.com>
Subject Re: High availability
Date Thu, 04 Oct 2012 08:30:16 GMT
On Thu, Oct 4, 2012 at 3:19 AM,  <Ullrich.Jans@elektrobit.com> wrote:
> Hi,
>
> I'm running a rather large Subversion installation (>1000 repos, >1 TB total storage,
>1000 users). I'm looking for advice how to improve our availability. We're currently quite
good, but I'm a bit worried about e.g. hardware failure. Performance is not an issue for now
(machine load <2, at about 20 svn-requests per second).
>
> How are you out there doing it? I have a few ideas, but I'd like to hear the opinions
of others and get maybe some pointers for more research.

Go call WanDisco. They have *precisely* this sort of high availability
setup in their commercial offerings, with consensus based selection of
a Subversion "master" among a set of synchronized distinct Subversion
servers, and I strongly suspect it's a lot more economical to buy
their product than spend your time implementing it from scratch.

> My ideas:
>
> * use svnsync replication. Drawback: failure needs manual intervention, hook scripts
need to be transferred manually.
> * use an active-passive cluster with e.g. heartbeat. That would be possible, the data
reside on a SAN anyway.
> * use an active-active cluster with two separate machines sharing the storage via a cluster
fs (GFS? GPFS?) with a HA load balancer in front. Probably the sexiest solution ;-)
> * I already discarded the idea of using active-active with NFS since I can remember the
reports of strange failures...
>
> Does anyone here know how other large/high profile sites (e.g. the Apache foundation)
are ensuring availability? I couldn't find any hints at the website...
>
> Cheers,
>
> Ulli
>
> --
> Ullrich Jans, Specialist, IT-A
> Phone: +49 9131 7701-6627, mailto:ullrich.jans@elektrobit.com
> Fax: +49 9131 7701-6333, www.elektrobit.com
>
> Elektrobit Automotive GmbH, Am Wolfsmantel 46, 91058 Erlangen, Germany Managing Directors:
Alexander Kocher, Gregor Zink Register Court F├╝rth HRB 4886
>
>
>
>
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