Re: Idea for new RAID type - background extended recovery information

[Michael Evans <mjevans1983@gmail.com>]

On Fri, Dec 11, 2009 at 11:22 PM, Kasper Sandberg
<postmaster@metanurb.dk> wrote:
> On Wed, 2009-12-09 at 11:53 +0100, Mikael Abrahamsson wrote:
>> On Wed, 9 Dec 2009, Michael Evans wrote:
>
> while this could work, i would personally far rather see raid6 gain all
> the recovery/sanity options possible. raid6 has multiple copies of the
> same data, and as long as you have >2 copies, you can begin to look at
> all the data sets, and with a pretty good probability weed out the bad
> set.
>

While I would like to have a layer that any storage use, including
other raid levels, could reside within.  Imagine how much smarter
raid6 could be if it already knew in advance which stripes had gone
bad?  Or if files older than a few seconds could also gain an
additional 'bad sector' survival; allowing the loss of whatever normal
raid tolerances plus a bad sector or two.  It would not be required,
but I believe it would be a good way of adding assurance to long-term
storage segments.

I implore you to comment on the original suggestion, or my reply to
his reply as well.