On Sun, Sep 04, 2016 at 07:08:04PM +0200, Clemens Eisserer wrote: > Hi, > > I am thinking about working with a root-fs on an external disk which > can be shared amongst different computers. > For this use-case the internal SSD could be used as caching device, > speeding up the access to the relativly slow external storage. > > What I wonder is how well bcache can cope with changing caching > devices? Great would be if bcache could detect when a backing decive > was used with a different caching device in the meantime and > automatically invalidate the old/stale caching device - but to keep > the cache unmodified when this was not the case. > > Is this use-case possible with bcache? On its own bcache won't automatically invalidate the cached data - once a backing device is associated with a certain cache, that backing device won't come online until either the cache device is registered, or you detach it. So you'll have to write your own scripts to check - "hey, is this backing device associated with this cache device? if not, detach backing device, reformat cache device, then attach cache device and backing device". -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
