I've installed openSUSE 11.2 (64bit) a while ago, and am mainly using it as a dedicated Apache hosting machine.

Everything has been working properly for a while (~1 month), but as of a few days back, the filesystem seems to have been turned to read-only (!?).

Pretty much every task fails, be it starting vi or even man pages (can't create files on disk).

Has anyone seen something like this before ? If so, what did you do to recover?
I tried googling for solution but failed to find a helpful answer.

Nota bene - no significant changes were made in this period, and machine load is very, very lightweight.