On Sun, 15 Dec 2013 20:01:57 -0500, Pavol Cupka <pavol.cupka@xxxxxxxxx>
wrote:
I would like to use a bcache for btrfs filesystem residing on two
identical disk as raid1 using btrfs' raid (without soft/hard raid).
Is it possible?
if I understood you correctly, no.
I would like to use the same ssd/ssd partition for caching both
drives/mirror. Is this doable?
You will have to build the btrfs 'raid' on top of two bcache devices. If
the caching device for both devices in the same SSD (partitioned) what's
the point? Assuming Btrfs has a similar feature set to MD's Raid1
write-mostly, you could accelerate the one side, and run the other half of
the mirror without acceleration. Otherwise I would just use MD's Raid1 and
be done with it. Put btrfs/ext4/xfs on top as you like.
Does your intended workload really benefit from putting an SSD into the
mix?
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