xfs spanning over ssd and hdd

[Matthias Neuer <mneuer@xxxxxx>]

Hi.

I have a slow and big hdd and a fast but small ssd and want to test the 
following setup but don't know if it's possible.
Use LVM to concatenate the ssd and the hdd linearly. Create a xfs 
filesystem on this device such that the sdd is filled first, i.e. data 
is written to the ssd as long as there is free space, otherwise the data 
is written to the hdd.
I have applications which may benefit from this setup but I am not sure 
so I need to do some benchmarks.
Thanks for your help
Matthias