Re: unbelievably bad performance: 2.6.27.37 and raid6

[Neil Brown <neilb@suse.de>]

On Sunday November 1, jnelson-linux-raid@jamponi.net wrote:
> On Sun, Nov 1, 2009 at 5:47 PM, Thomas Fjellstrom <tfjellstrom@shaw.ca> wrote:
> > On Sun November 1 2009, NeilBrown wrote:
> 
> >> Reshaping to a new chunksize is possible with the latest mdadm and
> >>  kernel, but I would recommend waiting for mdadm-3.1.1 and 2.6.32.
> >> With the current code, a device failure during reshape followed by an
> >> unclean shutdown while reshape is happening can lead to unrecoverable
> >> data loss.  Even a clean shutdown before the shape finishes in that case
> >> might be a problem.
> 
> Do you know if the stable series 2.6.31.XX incorporates the appropriate fixes?

They haven't been written yet.....
The kernel change is very small I think so it will go in to -stable.
But I want to write the mdadm changes first (which are bigger) and be
sure I don't need any other kernel changes.

NeilBrown
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