Re: Improving RAIDframe Parity Handling: The Diff

[Matthias Scheler <tron%zhadum.org.uk@localhost>]

On Wed, Nov 04, 2009 at 01:55:54PM -0600, Greg Oster wrote:
> If your disk is "all busy, all the time", then parity zones arn't going
> to buy you much...

Indeed. And I doubt this can or should be fixed in FFS. A log structured
file-system would probably work better in this case.

> Even if there are 500 of 4000 zones marked as 'dirty' the checking
> is still going to nearly an order of magnitude faster than before.

Even 2000 on of 4000 zones would speed up parity rebuild on my
system by over an hour. On a modern (almost) 2TB hard disk each
zone would be 0.5GB large. Not copying it around saves a lot
of time.

        Kind regards

-- 
Matthias Scheler                                  http://zhadum.org.uk/