linux-kernel - Re: [PATCH v4 1/2] dm-unstripe: unstripe RAID 0/dm-striped device

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Message-ID: <20171218193746.GB6149@redhat.com>
Date:   Mon, 18 Dec 2017 14:37:47 -0500
From:   Mike Snitzer <snitzer@...hat.com>
To:     Scott Bauer <scott.bauer@...el.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        keith.busch@...el.com, dm-devel@...hat.com, agk@...hat.com,
        jonathan.derrick@...el.com
Subject: Re: [PATCH v4 1/2] dm-unstripe: unstripe RAID 0/dm-striped device

On Mon, Dec 18 2017 at  2:32pm -0500,
Mike Snitzer <snitzer@...hat.com> wrote:

> On Mon, Dec 18 2017 at  1:52pm -0500,
> Scott Bauer <scott.bauer@...el.com> wrote:
> 
> > 
> > > > +config DM_UN_STRIPE
> > > > +       tristate "Transpose IO to individual drives on a raid device"
> > > > +       depends on BLK_DEV_DM
> > > > +       ---help---
> > > > +	  Enable this feature if you with to unstripe I/O on a RAID 0
> > > > +	  device to the respective drive. If your hardware has physical
> > > > +	  RAID 0 this module can unstripe the I/O to respective sides.
> > > 
> > > What does "sides" mean above?
> > 
> > Should say, "members". There's also an alternative patch set out by Heinz
> > that I am currently testing/writing comments for. It looks like we'll use
> > his version after I submit my comments (IE take the stuff I put in my v4
> > to fix your comments).
> 
> Can you be more specific?  I've not seen anything from Heinz.
> 
> I've been reviewing your v4 and modified it to match dm-stripe.c more
> (like Alasdair asked for).

When the right hand isn't aware the left is doing something ;)

I'll combine my effort with Heinz's.

Please don't send another revision until you see what I've come up with.

Thanks,
Mike