The benchmarks DO appear to show a modest improvement. In the bugzilla post you linked, Paolo said that "With 4k logical sector size in the host, you must have a 4k logical sector size in the guest too." So it appears you'd need to use a disk that physically supports it, along with an OS that supports it also. RHEL7 supports it, here's some detail: https://access.redhat.com/solutions/56494 On Mon, Apr 23, 2018, 10:47 AM Tim Bell <Tim.Bell at cern.ch> wrote: > > > Has anyone experience of working with local disks or volumes with > physical/logical block sizes of 4K rather than 512? > > > > There seems to be KVM support for this ( > http://fibrevillage.com/sysadmin/216-how-to-make-qemu-kvm-accept-4k-sector-sized-disks) > but I could not see how to get the appropriate flavors/volumes in an > OpenStack environment? > > > > Is there any performance improvement from moving to 4K rather than 512 > byte sectors? > > > > Tim > > > _______________________________________________ > OpenStack-operators mailing list > OpenStack-operators at lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20180423/87c42b4b/attachment.html>