[OpenAFS] Re: High Available Transparent Shared-Disk

[Simon Wilkinson]

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know which OSDs have the 'correct' data, and which have out-of-date =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.