Re: Adding caching to existing volumes?

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On Wed, Jan 23, 2013 at 06:17:44PM +0100, Roy Sigurd Karlsbakk wrote:
> > You've got to start from scratch, unfortunately.
> > 
> > The reason is that there needs to be a bcache specific superblock on
> > the
> > backing device so bcache can keep the cache and backing device in sync
> > -
> > and especially so you can't accidentally mount and use the backing
> > device without the cache. That would be bad.
> > 
> > I just added an explanation to the faq - thanks for pointing it out.
> > http://bcache.evilpiepirate.org/FAQ
> 
> Then, what happens when the SSD dies?

Formatting a backing device for bcache is separate from attaching it to
a cache device - you can always run it in passthrough mode, and if the
SSD dies while it's in use it'll automatically/transparently detach and
switch to passthrough mode.
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