On 02/20/2013 08:19 PM, Alex Elsayed wrote:
Matias Bjorling wrote:
Here is a short proposal for the hybrid storage cache idea with
introduction/motivation and a bird's eye view of an approach to implement
a hybrid storage cache for btrfs. Please note that there is currently no
available patches. We would like to get as much input before as possible
before we start designing and implementing a solution.
Just to toss this out there, aside from the option of 'cache chunks' there
is the option of using normal chunks, and instead place extents on chunks
based on performance characteristics of the underlying device.
As an analogy, if the above proposal is closer to the 'bcache' approach of
treating the SSD purely as a performance enhancer that does not contribute
to capacity, performance-based allocation is closer to the 'btier' [1]
approach in which the SSD does contribute to capacity, but has 'dibs' on
performance-sensitive data.
[1] Btier sourceforge page: http://sourceforge.net/projects/tier/
Lessfs homepage, with btier info: http://www.lessfs.com/wordpress/
Good point. I think both approaches are relatively easy to combine.
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