<div dir="auto">The benchmarks DO appear to show a modest improvement.<div dir="auto"><br></div><div dir="auto">In the bugzilla post you linked, Paolo said that </div><div dir="auto"><pre style="font-size:medium;white-space:pre-wrap;word-wrap:break-word;width:50em">"With 4k logical sector size in the host, you must have a 4k logical sector size in the guest too."</pre></div><div dir="auto">So it appears you'd need to use a disk that physically supports it, along with an OS that supports it also.</div><div dir="auto"><br></div><div dir="auto">RHEL7 supports it, here's some detail:</div><div dir="auto"><br></div><div dir="auto"><a href="https://access.redhat.com/solutions/56494">https://access.redhat.com/solutions/56494</a><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Apr 23, 2018, 10:47 AM Tim Bell <<a href="mailto:Tim.Bell@cern.ch">Tim.Bell@cern.ch</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Has anyone experience of working with local disks or volumes with physical/logical block sizes of 4K rather than 512?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">There seems to be KVM support for this (<a href="http://fibrevillage.com/sysadmin/216-how-to-make-qemu-kvm-accept-4k-sector-sized-disks" target="_blank" rel="noreferrer">http://fibrevillage.com/sysadmin/216-how-to-make-qemu-kvm-accept-4k-sector-sized-disks</a>)
 but I could not see how to get the appropriate flavors/volumes in an OpenStack environment?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Is there any performance improvement from moving to 4K rather than 512 byte sectors?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt">Tim<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11.0pt"><u></u> <u></u></span></p>
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