cacti boost_server

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I'm having a file permission problem with boost server:

It's creating the directories with as the correct user, but the files inside are being created by "root"

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drwx------ 2 www-data www-data 4.0K Jun 30 19:40 .
drwxrwxrwx 4 root     root     4.0K Jun 30 19:40 ..
-rw------- 1 root     root     7.4M Jun 30 19:40 16.rrd

In boost settings:

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Effective User ID
This UNIX/LINUX only option allows you to use this users UID to create and otherwise operate on RRD's. In order to use this, you must also be using the 'posix' module in PHP. A Boost Server restart is required to enact any changes in this setting.

Is set to "www-data"....

I'm getting the following error in the logs:

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06/30/2015 07:39:49 PM - CMDPHP: Poller[0] ERROR: Unable to set directory permissions for '/usr/share/cacti/rra/2'

I'm not really sure what POSIX is or how to use it with PHP.... anyone able to help?

Thanks