Re: discuss about commit 3b0f9ce: filter-mpath: get wwids from sysfs vpd_pg83

On Tue, 2023-11-14 at 18:48 +0100, Martin Wilck wrote:
> On Tue, 2023-11-14 at 11:00 -0600, David Teigland wrote:
> > On Tue, Nov 14, 2023 at 10:44:02AM +0000, Martin Wilck wrote:
> > > I haven't looked into "system.devices" so far. Is there a high-
> > > level
> > > description of this feature available somewhere? A link would be
> > > appreciated. On (open)SUSE, afaik, system.device is not used
> > > (Heming,
> > > correct me if I am wrong).
> > 
> > https://man7.org/linux/man-pages/man8/lvmdevices.8.html
> > 
> > If that's too low-level let me know and I'll look at writing
> > something
> > more conceptual and introductory.
> 
> It looks allright.

    "mpath_uuid is used for dm multipath devices, reported by sysfs."

So users are supposed to use "mpath_uuid" if they want to use multipath
devices as PVs? What if the user simply uses "sys_wwid" or "sys_serial"
for a multipath device? Will LVM perform any kind of multipath
detection, and if yes, how?

Martin