[ZODB-Dev] Clustering ZEO Server with drbd
Christian Theune
ct at gocept.com
Mon May 29 12:02:52 EDT 2006
garthpl at periweb.com wrote:
> If you setup drbd and heartbeat , the spare will take over the floating
> ip from the zeo server and restart the service. drbd is simply doing a
> block level replication of the zeo server file system where the zeo data
> is stored. The question is what files needs to be replicated so that
> when the the service is restarted on the spare, all the files needed by
> the zeo server to operate are there? I'm trying to ensure from a system
> architecture standpoint I'm not missing anything.
When using FileStorage, you'd need the Data.fs.* files, except Data.fs.lock.
In the end, this might not be exactly HA because you'll have a period of
time that isn't covered and may stretch for quite a while. (But I don't
know about the HA terminology anyway...)
(Re)starting the ZEO server when it is needed might take a while on
large databases if the index file happens to be broken.
Christian
--
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fax +49 345 122 9889 1 - zope and plone consulting and development
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