On 12/13/2017 06:36 PM, Sage Weil wrote: > We don't really have a need to resize devices, generally, so that's > probably not an issue... but I wonder if (1) is going to be an > easier/smaller change to make this work. It maps more directly onto the > threat model (a lost *device*) and probably also avoids some DM layers, > and so ought to be slightly faster? DM is based on stacking device model, linear mapping (normal LV in LVM) cost you almost nothing - it is just offset overwrite inside kernel. So if you think about layering linear devices, the speed difference should be negligible. With dm-crypt it is something different - it need to clone bio requests and then encrypt/decrypt them. Milan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
