FT> I thought that dm-userpsace supports a feature to map a single FT> request to multiple devices for kinda raid. For that, I guess that FT> struct dmu_msg_map_response includes several sets of dst_maj and FT> dst_min. Or you might use 'linked' dmu_msg_map_response, which FT> enables a user-space daemon to send multiple dmu_msg_map_responses FT> for one dmu_msg_map_request (if a dmu_msg_map_response is marked FT> 'linked', dm-userspace module clones the bio and does not free FT> struct the dmu_request). Hmm, I had not planned to implement this kind of behavior, but I can see the benefit. I think it would be best to focus on performance for now and add that capability later. -- Dan Smith IBM Linux Technology Center Open Hypervisor Team email: danms@xxxxxxxxxx
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