Server Version: LI-V2.1.0.17798 Firebird 2.1

Have solved a speed problem on 2.1 by setting forced writes off on
each of our databases.

However we have had 2 ocurances of the databases 'freezing'.
In short IBExpert, etc. can see and query the server, but the
databases themselves are not accessible, as if they don't exist of are
off-line (even to SYSDBA). Other files on the server are accessible.
Also its not possible to take a backup.

This never happened until we upgraded to 2.1 (from 2.0) and we have
deliberately not upgraded our programs at the same time. Running as
classic.

Following a reboot of the server all OK and database can backup and
restore.