> Are there design limitations that would exclude running a large number of distinct FB 2.5 SuperClassic instances on a same box? Each instance would serve a strictly different set of databases (think of an ISP doing customer hosting with one SuperClassic per customer).

Page cache is still per connection and not per instance.

Check out my architecture comparison sheet on my blog:
http://blog.upscene.com/thomas/index.php?entry=entry091016-133211


--
Best Regards,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2
Upscene Productions
http://www.upscene.com
My blog:
http://blog.upscene.com/thomas/

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