[OpenAFS] Re: High Available Transparent Shared-Disk

Matt W. Benjamin matt@linuxbox.com
Mon, 11 Apr 2011 14:38:54 -0400 (EDT)


It's useful to document these limitations, but of course, they don't necessarily rule out rxosd mirroring having utility for some application.  Also, I had the impression rxosd was undergoing development.


----- "Simon Wilkinson" <sxw@inf.ed.ac.uk> wrote:

> On 11 Apr 2011, at 17:13, Matt W. Benjamin wrote:
> > The variant of OpenAFS called rxosd has write mirroring, too, I
> believe
> One of the discoveries of the Edinburgh Hackathon was that whilst
> rxosd has mirroring, it doesn't have any mechanism for keeping the
> mirrors in sync. This means that if a single OSD goes offline from a
> mirror, when it comes back up you have data consistency problems. As
> there is no data version stored on the OSDs, recovering from this is
> hard, as you don't know which OSDs have the 'correct' data, and which
> have out-of-date data.
> Cheers,
> Simon.
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Matt Benjamin

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