-----Original Message-----
From: linux-bcache-owner@vger.kernel.org [mailto:linux-bcache-
owner@vger.kernel.org] On Behalf Of matthew patton
Sent: mercredi 29 janvier 2014 18:51
To: linux-bcache@vger.kernel.org
Subject: Re: Moving a backing device between 2 cachesets

quoted

When you register a newly formatted backing device it'll come up
in passthrough mode, and then you can attach and detach a backing

device

quoted

from
a cache set at runtime - while it's mounted and in use. Detaching
implicitly
invalidates any cached data for that backing device.

so it's better to think of bcache as adding and subtracting backing (aka
real devices with user data) from a notionally "static" cacheset?

That's at least how we're currently using bcache on our test setup in order
to avoid using shared (SAS) SSD.

I also know about interposers but never used any and would like to avoid
them if possible.

Moving a resource from one cachet to the other will be a rare event
(maintenance, patch, test, crash) and I don't care having to start again
with a cold cache in this case, including when re-assigining to resource to
its original "home" cacheset. 

Regards, - Patrick -