From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: md road-map: 2011
Date: Thu, 17 Feb 2011 08:36:43 +1100
Message-ID: <20110217083643.16404187@notabene.brown>
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	<4D5C0760.4090304@gmail.com>
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To: Joe Landman <joe.landman@gmail.com>
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On Wed, 16 Feb 2011 12:20:32 -0500 Joe Landman <joe.landman@gmail.com> wrote:

> On 02/16/2011 05:27 AM, NeilBrown wrote:
> >
> > I all,
> >   I wrote this today and posted it at
> > http://neil.brown.name/blog/20110216044002
> >
> > I thought it might be worth posting it here too...
> 
> Another request would be an incremental on-demand build of the RAID. 
> That is, when we set up a RAID6, that it only computes the blocks as 
> they are allocated and used.  This helps with things like thin 
> provisioning on remote target devices (among other nice things).
> 

That is exactly what the non-sync bitmap is supposed to do.  On the first
write to a region that is marked as not-in-sync, a resync for just that
region is triggered.

Thanks,
NeilBrown