Hi,
After installation of new VM3 in both Joomla 2.5 and Joomla 3 environments I've noticed that vmfile.php, which is created in libraries\joomla\cache\storage folder, is totally the same in both places. As far as this code is created based on standard Joomla 2.5 file.php and contains just few small changes comparing to it ("Additional check for file and replacement of file_exists to is_file by Max Milbers"), it can't be used in Joomla 3 environment, because standard Joomla 3 file.php is different from the 2.5 one. Thus I think you should create the separate vmfile.php for Joomla 3.
Best regards,
Alexey
Effengia Team
http://effengia.com (http://effengia.com)
Good to know, thank you.