Re: raid5 - again

On Sat, Feb 19, 2011 at 10:11:30PM +0100, Roy Sigurd Karlsbakk wrote:

It's been some two years since I read about the becoming of raid5
etc in btrfs. Since the code is available in linux, why isn't this
already in btrfs? Is Oracle holding back?

   It's about resourcing and stability. Oracle only employ one person
(AFAIK) on btrfs -- Chris Mason. He does a sterling job of maintaining
and developing the filesystem, but there is only one of him.

   Since well before December, he's been working on a functional fsck,
trying to get it to a state where it won't demolish your filesystem
even more than it already is. This has left the work to integrate the
RAID-5/6 patches behind. He's also been working hard on fixing a great
many other stability issues as they're reported, and integrating
patches from other developers.

   I believe that RAID-5/6 is the next major piece of work that Chris
is intending to integrate, once fsck is ready. However, stability is
better than features at this point. I don't see any commercial benefit
in preventing the integration and deployment of the RAID-5/6 patches,
but simply that there's other things that are more important. Please
be patient.

   Hugo.

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