More on high i/o load wedging Fedora 10

[Bruno Wolff III]

On Wed, Mar 18, 2009 at 10:15:14 -0500,
  Eric Sandeen <sandeen at redhat.com> wrote:
> 
> # echo w > /proc/sysrq-trigger
> # dmesg > dmesg_output.txt
> 
> should work on any fedora machine out of the box.

What if the logging filesystem has already been made read only because of
a problem? Will the above still work if the dmesg_output.txt file is
on some writeable file system?
(It's for a different problem I have been having, not the one in this thread.)