Entire file system goes read-only

[Edward Ned Harvey]

> From: discuss-bounces-mNDKBlG2WHs at public.gmane.org [mailto:discuss-bounces-mNDKBlG2WHs at public.gmane.org] On
> Behalf Of edwardp-mh2Nk+tgbQM at public.gmane.org
> 
> On one system while it's running, something occurs which causes the
> /entire/ Ubuntu (10.04 LTS) file system to become read-only.  It was

I had this a couple years ago on rhel/centos.  For me, it was caused by
failing hardware.  I forget if it was the disk, controller, cpu,
motherboard, or what.  I forget precisely how we diagnosed it, but most
likely, I would have reformatted the system and/or swapped parts back and
forth with its neighbor.

(These systems were a bunch of identical compute clones in a farm.)