if your intention is to have all zope clients use the same ZODB then that is not possible. only one process can open the database at a time, meaning if you need more than one client you must use ZEO. jens On Wednesday, Jun 4, 2003, at 03:55 US/Eastern, Dennis Allison wrote:

I'm putting together a system which will include multiple Zope instances, mostly independent, some not. Some I want to run with a ZEO backend, others I want to use the local file system for storage management. Has anyone had any experience putting together a multi-instance system where some instances use ZEO and others don't?

I'm putting together a system which will include multiple Zope instances, mostly independent, some not. Some I want to run with a ZEO backend, others I want to use the local file system for storage management. Has anyone had any experience putting together a multi-instance system where some instances use ZEO and others don't?

If by this you mean several Zope installations running on the same machine, some using ZEO and some using FileStorage/DirectoryStorage, then it's not even close to a problem. Several (or even many) Zope instances will run alongside each other just fine, so long as you take care to distribute ports (and maybe IPs) uniquely. I do this all the time, and so do a lot of other people. You can have separate full installations for each instance, or you can have them share the same "executables" by setting up a software_home and several instance_homes, each of which can be configured to do whatever you want with regards to storage, extra products, etc. (You cannot have multiple instances running with the same storage, however.) If you're going to be dealing with these a lot, you should take a look at the zopectl script, which has some clever support for managing multiple instances. You should also evaluate whether or not you really need to do this, because I suspect you can probably get the same thing done with one instance with a VHM and mounted storages, though you can't control installed products on a per-area basis this way. See http://www.zope.org/Members/jim/ZODB/MountedDatabases http://www.zope.org/Members/anthony/software/MountedFileStorage and especially... http://hathaway.freezope.org/Software/DBTab http://hathaway.freezope.org/Software/Ape --jcc