Upgrade from 1.9.3 to 2.2

Hi,

I have Moodle 1.9.2 running on a 32 bit Debian server.

My users have asked me to upgrade to Moodle 2.2, and my server admin team want to move from 32-bit Debian to 64-bit RedHat Enterprise Linux.

I've got the 64 bit RHEL server configured, and have installed Moodle 1.9.2 on it. I've copied the database from the old server across, along with the contents of the moodle subdirectory and the moodledata subdirectory. I tested this configuration out and everything seems to be working fine on the new server.

All that's left now is the upgrade.

I can see some instructions here for upgrading Moodle, but I'm concerned that making such a large version jump (from 1.9.2 to 2.2) might cause some problems.

Can anybody tell me if there are any known issues going between these versions, or any specific guide for going from 1.9 to 2.x?

Thanks!

David