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On 29 May 2006, at 16:45, Christian Theune wrote:

[EMAIL PROTECTED] 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.

The hot spare ZEO server in a ZRS setup is read-only. ZEO clients will be glad to switch to it automatically (this is a built-in ZEO feature, you can specify more than one server and the clients will hunt for another one if the first one goes down), but if you want to make the hot standby read/write you have to restart it.

jens


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