Thread: Filesystem solution for database redundancy

Has anyone looked into a filesystem solution for database redundancy?

I knew at one time there was a Linux device driver that would copy all
changes to device X to a network block device Y.

Two questions:

 * Does anyone know what this driver was or any documentation to it?

 * Is this enough for database redundancy (assuming it was combined with
appropriate scripts for starting up database 2 if database 1 failed)

Jon