Evgeny Putilin wrote:

> At conversation on creation cluster for Firebird all thoughts have been turned towards possibility classic engine with distributed lock manager. This variant allows cluster with support of two features. But it has the lacks:
> - There is not very good possibility to solve split-brain syndrome.
> - It is necessary to bring many changes in a engine code
> --- Adaptation FB lock manager to OpenDLM
> --- Search of the solution for a parcel event
> --- Problems with cache pages that the written down page has appeared on all sites cluster
>
>

You should be aware that Interbase was original designed to work on
VAXClusters with the VMS distributed lock manager. The original lock
manager was, in fact, polymorphic with the VMS DLM for that reason.
Plug in a DLM, and classic should work unchanged on clusters with a DLM
and shared storage.