On Tue Apr 16, 2013 at 05:46:07PM +0200, Roy Sigurd Karlsbakk wrote:
> > > Is there any method to just resync WRITTEN data to new-added-disk ?
> > > Or any developing plan to add this feature?
> >
> > No, because md is a block device it has no knowledge of what data has
> > actually been written to the disk or where it is stored. This means it
> > has to rebuild the entire disk.
> >
> > There are plans to improve this by keeping track of which stripes have
> > been written to, which should help (and will also mean no need for an
> > initial RAID sync). I don't know whether this has progressed beyond
> > the idea stage yet though.
>
> Interesting - do you have any docs about this? I haven't seen any talk
> on this list about it...
>
It's from Neil's 2011 MD/RAID roadmap:
http://neil.brown.name/blog/20110216044002
The basic idea was mentioned in a 2009 roadmap as well, but is a lot
more fleshed out in the above one.
Cheers,
Robin
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