Re: [lvm] [christophe.varoqui@free.fr: dm multipath target]

[Patrick Mansfield <patmans@us.ibm.com>]

On Fri, Aug 22, 2003 at 10:51:46AM +0200, Heinz J . Mauelshagen wrote:
> On Thu, Aug 21, 2003 at 06:34:52PM +0200, christophe.varoqui@free.fr wrote:

> > 2) multipath support for "bizarre" arrays need a userspace callback on path failure.
> > Agreement seems to be reached. Still not clear what provides this callback :
> > MD/DM or Block Layer ?
> 
> Presumably device-mapper multipath is the one we end up with at the
> end of the day, the answer is DM (the status information retrievable from
> DM provides it already)

The sending of any special command to enable an alternative path (like the
ghost LUN) should be done in a kernel thread or some way that allows the
root file system to be multi-pathed on such devices.

> Setting up a multipath mapping using dmsetup means creating a one line
> mapping table with a couple of parameters per path (see multipath target
> code we plan to release next week).

Is this the same code Joe is working on?

-- Patrick Mansfield