I don't know if this is the same problem or not: We've been running 1.5 since June, most recent upgrade two weeks ago to 1.5.2+, have not seen this problem at all until today. Had one copy of Moodle up in Firefox, pulled up another to check IE view, got this message:
Your session has timed out. Please login again.
Warning: Unknown(): write failed: Disk quota exceeded (122) in Unknown on line 0
Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/home/aimdt/moodledata/sessions) in Unknown on line 0
For over an hour I couldn't login under any name in either IE or Firefox, but I could work normally in the original copy I had up in Firefox. Starting a new browser and going to the site login page produced the timeout message (without the two warnings) very briefly before any login was attempted.
I had just finished reading this thread (trying to login at various times), and then I got in again. I am not currently seeing any problem. I am not aware of having changed anything (other than a font size change to some text in an assignment) during the entire episode, though another admin may have been creating classes and adding students during that time.
Any ideas on what might have happened? It looks OK now, but I have no idea what went wrong nor how to go about correcting it if it happens again. Fortunately no students were on this afternoon, but who knows about next time.
Linux server, Apache 1.3.33 (Unix), PHP 4.3.10, MySQL 4.1.13, Moodle 1.5.2+ v2005060222, was using WinXP and Win2k.