[Zope] Re: ZEO with Multiple Storages

[Jens Vagelpohl]

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On 14 Sep 2006, at 20:49, Brian Brinegar wrote:

>>> One ZEO server can deal with multiple storages just fine.
>>> Transactions involving multiple storages commit just fine.
>>
>> Caveat: You buy nothing by having a single ZEO process serve several
>> ZODBs when you're trying to decrease commit times. You should run a
>> ZEO process per ZODB you're serving out, that way the writes can be
>> segregated and parallelized. That also makes it easier to move
>> processes/databases around disks/hosts to spread I/O load.
>
> Just to clarify, you are saying that a single ZEO server would not be
> able to deal with multiple storages simultaneously and that a
> transaction in one storage would block transactions in all other  
> storages.

ZEO server processes are single threaded, access to the databases  
must be serialized.


> However, if we were to run multiple ZEO processes this would not be  
> the
> case?

Right.

jens



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