[ZODB-Dev] Handling more databases with zeo
dieter at handshake.de
Thu Jun 30 15:01:28 EDT 2005
Jeremy Hylton wrote at 2005-6-29 15:31 -0400:
>The benefit is that you get to run
>several storages using a single ZEO server process and TCP port. It's
>probably not a good idea to use a single process for many servers,
>although it might be convenient to use a single port.
Maybe, I can provide a use case:
We have a content management system on top of Zope/CMF/ZEO.
For easier backup and recovery, the total data (in the order
of several 10 GB) is distributed over about a dozen self
We have a high availability cluster with 4 ZEO services,
each with its ZEO server. The HA software periodically
probes its services, restarts them if they do not respond
in time and, if necessary, moves them to a different cluster node.
On the average, each ZEO server is responsible for about 4
storages, although some have a single one while others have
Thus, for us, it is quite natural to have a ZEO server be responsible
for several storages.
Of course, we will find a solution should you decide to remove
the feature (then a ZEO cluster service would no longer consists
of a single ZEO process but of several; probing and configuration
would become more complex), but, for us, it is nice as it is now :-)
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