Il 17/07/2013 17:54, ronnie sahlberg ha scritto: > I think it is reasonable to assume that IF LBPRZ==1 and IF it is an > "optimal unmap request" then the blocks will become unmapped and they > will read back as 0.
Yes, but it is not reasonable to assume that bdrv_discard will only receive "optimal" requests. Thus, using WRITE SAME for LBPRZ=1, and not exposing LBPRZ=1 if LBPWS=0 (may also use LBPWS10 depending on the capacity), is the safer thing to do. Paolo
