[dm-devel] RFC for multipath queue_if_no_path timeout.

[Alasdair G Kergon]

On Thu, Sep 26, 2013 at 10:47:13AM -0700, Frank Mayhar wrote:
> Launching it from ramdisk won't help, particularly, since it still goes
> through the block layer.  The other stuff won't help if a (potentially
> unrelated) bug in the daemon happens to be being tickled at the same
> time, or if some dependency happens to be broken and _that's_ what's
> preventing the daemon from making progress.
 
Then put more effort into debugging your daemon so it doesn't have
bugs that make it die?  Implement the timeout in a robust independent
daemon if it's other code there that's unreliable?

> And as far as lvm2 and multipath-tools, yeah, they cope okay in the kind
> of environments most people have, but that's not the kind of environment
> (or scale) we have to deal with.

In what way are your requirements so different that a locked-into-memory
monitoring daemon cannot implement this timeout?

Alasdair