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Subject High availability
Date Thu, 04 Oct 2012 07:19:10 GMT

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.

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...



Ullrich Jans, Specialist, IT-A
Phone: +49 9131 7701-6627,
Fax: +49 9131 7701-6333,

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