[ZODB-Dev] Clustering ZEO Server with drbd

[Christian Theune]

garthpl at periweb.com wrote:
> Hi folks, I'm looking at making a scalable zope infrastructure, I can 
> scale the ZEO clients and mysql, the only issue is the ZEO server. I 
> have used drbd and heartbeat in the past to create a HA lamp stack. From 
> a technical standpoint, is there any reason I could not use drbd to 
> cluster the ZEO server? Any thoughts would be appreciated.

As far as I understand, the difference to ZRS (which is a solution to 
scale ZEO servers, e.g. for HA) that you will need to restart the ZEO 
server when switching a hot-spare ZEO server to "live-mode", because it 
doesn't notice when the underlying storage file is changed by somebody else.

Christian

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