[dm-devel] dm-cache for Fedora 21?

[Rolf Fokkens]

On 01/16/2014 02:46 AM, Paul B. Henson wrote:
> From a use case perspective, I'd like to be able to point to a pv (or 
> perhaps a vg), and say 'speed up that pv/vg with XG of cache', so 
> hopefully that will be supported by lvm. My tentative layering for 
> testing dm-cache prior to lvm support was going to be <raw 
> disk><dm-cache><pv>, ie, the pv was going to be created on the cached 
> device... -- dm-devel mailing list dm-devel at redhat.com 
> https://www.redhat.com/mailman/listinfo/dm-devel 
Related to my bcache experience I appreciate this way of layering block 
devices. Thought on the other hand I can also appreciate the ability to 
decide per LV to apply caching or not, people did this with bcache as 
well (<raw-disk><pv><vg><lv><bcache>).

For the moment I assume dm-cache is a per LV caching system (since 
nobody confirmed Paul's idea). This leaves me wondering if the cache 
(device) can be shared by multiple LV's. I would really like this, is 
this the case?

Rolf