[dm-devel] [RFC] How to fix system stall on root volume multipath

[Kiyoshi Ueda]

Hi Alasdair,

On Sat, 10 Nov 2007 03:31:13 +0000, Alasdair G Kergon <agk at redhat.com> wrote:
> On Fri, Nov 09, 2007 at 06:17:19PM -0500, Kiyoshi Ueda wrote:
> > If we use multipath for "/", temporal all-paths failure could lead to
> > system stall because multipathd depends on callout programs on "/".
> > I would like to hear your comments about my idea to fix it.
>  
> I thought it avoided that problem by pre-loading everything into a ramdisk:
> did that code get dropped for some reason?

Thank you for the information!  I had forgotten it!
Yes, we used to have it, and it seems to be removed by the commit below:
    http://git.kernel.org/gitweb.cgi?p=linux/storage/multipath-tools/.git;a=commitdiff;h=cad20ecf8919b2126ab6f4f793a1a738e9864f59

And probably the following thread is related to the commit.
    https://www.redhat.com/archives/dm-devel/2005-July/msg00044.html


Ben, Christophe,
Is that code still problem for current multipathd?
And what do you think about my proposal?

Thanks,
Kiyoshi Ueda