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@xxxxxxxxxx
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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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