Re: Forcing root filesystem read-only during normal operation

[Ron Johnson <ron.l.johnson@cox.net>]

On 2009-09-09 04:05, Ross Peachey wrote:
> Hi All,
>
> Can anyone tell me how to force a filesystem read-only from Debian
> during normal operation? I need to do this for testing of a failure
> mode.
>
> The following doesn't work:
>
> * hdparm -r1 <device>
> * mount -o ro,remount /
>
> Also, the host is running as a Xen virtual machine, so I can't do
> anything on the hardware side.
>
> Given that the filesystem is set to remount read-only if an error is
> detected, one option would be to deliberately generate a filesystem
> error, but not sure exactly how to achieve this either.
>
> Any pointers or assistance would be greatly appreciated.

"ro" is a valid option in /etc/fstab.

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