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



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 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


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