[dm-devel] [PATCH 2/4] libmultipath: fix priorities in parse_vpd_pg83

[Martin Wilck]

On Mon, 2021-03-29 at 13:20 -0500, Benjamin Marzinski wrote:
> > 
> > multipathd could figure out the system configuration from the (non)
> > availability of certain properties, and use an appropriate fallback
> > logic for either case.
> 
> That seems like reasonable first step, although one that won't help
> SID,
> since it can't rely on getting the wwid from udev. 

Can you conceive of a different approach that would be better for SID?
I'd like to hear about it.

>  This actually brings
> up a different point I have. Is your main objection to adding more
> config options that it is complicating the code, or confusing the
> users?

Both, with emphasis on the latter. I'm quite positive that we have too
many options already. That doesn't mean I would generally oppose new
options if they make sense. We should rather try to get rid of some new
ones that nobody uses any more.

> Because multipath wouldn't need to add any configuration options to
> be
> easily usable with SID (the current workaround, setting uid_attribute
> to
> "", is pretty non-obvious to users) if it could just check if sid was
> running, and key off that.  However this adds even more code
> complexity
> than simply checking a config option. I don't know how you would feel
> about accepting a patch that does this, when SID is production ready.

I could live well with this autodetection. I think it would be better
than doing the same thing with a configuration options.

Regards,
Martin


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