Re: Converting existing partition to bcache backing device without loss of data

ven. 09 août 2013 02:36:57 CEST, Kent Overstreet a écrit :

On Thu, Aug 08, 2013 at 09:27:33AM -0700, Adam Brenner wrote:

quoted

Howdy,

I am in the process of testing bcache on our HPC cluster to act as
cache for our gluster storage (~750TB).

I notice that during the setup process on our test cluster, our
backing device (where all our data is stored) will need to be
formatted in order to support bcache.

Does a way exist so we do not have to format our backing device? Or is
working being done to support this?

Unfortunately, there's no general purpose way - the faq explains why (I
just fixed the wiki so it's there again :)

http://bcache.evilpiepirate.org/FAQ/

However, Gabriel de Perthuis has a tool to do in place conversion - I
can't remember if it was limited to lvm devices or not - Gabriel, what
was the link to that again? I should stick a link to it in the wiki or
give you an account on it so you can.

Yup, here is my conversion tool: https://github.com/g2p/blocks

I've added it to the FAQ.