On Thu, Jul 14 2016 at 12:21am -0400, Jon Bernard <jbernard@xxxxxxxxxx> wrote: > Do you have any intuition on where to start looking? Joe asked me a very basic/obvious question: is block zeroing enabled? (block zeroing is enabled by default -- you have to know to disable it) If zeroing wasn't disabled that could explain some of the sizable performance differences. Please use/test the 'skip_block_zeroing' feature if you aren't already (also see the "Zeroing' section of the 'lvmthin' manpage). Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
