[sheepdog-users] About split brain

[Liu Yuan]

On Tue, Aug 20, 2013 at 08:09:09AM +0200, Valerio Pachera wrote:
> 2013/8/20 Liu Yuan <namei.unix at gmail.com>:
> > We actually purge data of backend store, but not the cache. I am not sure if
> > we should purge the cache too.
> 
> This depends on what we have done.
> If the node simply went down with a running guest
> a) I *do not* start the guest on any other host; insert back the node;
> run the guest again on the same node.
>     In such case I need the cache to be there and to be correctly flushed.
> b) The case of the previous mail: vdi has been removed while node was down.
>     Cache and data should be purged.
> 
> Is sheepdog able to "understand" case 'b'?

I'm afraid no. 

I'll add a 'vdi cache purge' command to manually purge the cache.

Thanks
Yuan