Hmm. Sorry i'm not fully understand.

I think :

create /dev/md0 with /dev/sda (sata) level=1 raid-devices=1
format /dev/md0 with bcache
format /dev/sdb (ssd) with brache

create bcache0 with /dev/md0 and /dev/sdb

why this is not possible?


2013/7/3 matthew patton <[email protected]>:
> short answer you can't. you can unbind the SSD from bcache and otherwise 
> remove the bcache config but you can't turn a live disk into a MD raid member 
> without destroying all data on it. Introduce the 2nd big hard disk and create 
> a raid1 on it with an absent mirror pair. DD or RSYNC the data from your 
> first disk to the new MD device. reconfigure first disk to be MD member and 
> let MD re-sync the (same) data back once more.
>
> add SSD and MD device to bcache config and it's now accelerated.



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Vasiliy Tolstov,
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