<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 22, 2018 at 6:53 AM, Zip <span dir="ltr"><<a href="mailto:plord@intricatenetworks.com" target="_blank">plord@intricatenetworks.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-serif"><div><div>Does it help if you edit the VM and under Resource Allocation – enable IO threads. ?</div></div></div></blockquote><div><br></div><div>Confusingly, it has nothing to do with IO threads.</div><div>Y.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-family:Calibri,sans-serif"><div><div><br></div><div>Zip</div><div><span class="m_-7545817514943267602Apple-style-span" style="font-size:12px;font-family:Verdana,Helvetica,Arial"><br></span></div></div><div><span class="m_-7545817514943267602Apple-style-span" style="font-size:12px;font-family:Verdana,Helvetica,Arial"><br></span></div><div><span class="m_-7545817514943267602Apple-style-span" style="font-size:12px;font-family:Verdana,Helvetica,Arial"><br></span></div><span id="m_-7545817514943267602OLK_SRC_BODY_SECTION"><div style="font-family:Calibri;font-size:11pt;text-align:left;color:black;BORDER-BOTTOM:medium none;BORDER-LEFT:medium none;PADDING-BOTTOM:0in;PADDING-LEFT:0in;PADDING-RIGHT:0in;BORDER-TOP:#b5c4df 1pt solid;BORDER-RIGHT:medium none;PADDING-TOP:3pt"><span style="font-weight:bold">From: </span> <<a href="mailto:users-bounces@ovirt.org" target="_blank">users-bounces@ovirt.org</a>> on behalf of Yaniv Kaul <<a href="mailto:ykaul@redhat.com" target="_blank">ykaul@redhat.com</a>><br><span style="font-weight:bold">Date: </span> Saturday, January 20, 2018 at 12:54 PM<br><span style="font-weight:bold">To: </span> Matthias Leopold <<a href="mailto:matthias.leopold@meduniwien.ac.at" target="_blank">matthias.leopold@meduniwien.<wbr>ac.at</a>><br><span style="font-weight:bold">Cc: </span> Wolfgang Lendl <<a href="mailto:wolfgang.lendl@meduniwien.ac.at" target="_blank">wolfgang.lendl@meduniwien.ac.<wbr>at</a>>, Ovirt Users <<a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a>><br><span style="font-weight:bold">Subject: </span> Re: [ovirt-users] VirtIO-SCSI and viodiskcache custom property<br></div><div><div class="h5"><div><br></div><div><div><div dir="auto"><div><br><div class="gmail_extra"><br><div class="gmail_quote">On Jan 19, 2018 3:29 PM, "Matthias Leopold" <<a href="mailto:matthias.leopold@meduniwien.ac.at" target="_blank">matthias.leopold@meduniwien.<wbr>ac.at</a>> wrote:<br type="attribution"><blockquote class="m_-7545817514943267602quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br><br>
is there a reason why the viodiskcache custom property isn't honored when using VirtIO-SCSI?<br><br>
On a Cinder (Ceph) disk "viodiskcache=writeback" is ignored with VirtIO-SCSI and honored when using VirtIO.<br><br>
On an iSCSI disk "viodiskcache=writeback" is ignored with VirtIO-SCSI and the VM can't be started when using VirtIO with "unsupported configuration: native I/O needs either no disk cache or directsync cache mode, QEMU will fallback to aio=threads"<br><br>
We actually want to use "viodiskcache=writeback" with Cinder (Ceph) disks.<br></blockquote></div></div></div><div dir="auto"><br></div><div dir="auto">That's because on block storage we use native io and not threads. I assume the hook needs to change to use native io in this case. </div><div dir="auto">Y. </div><div dir="auto"><br></div><div dir="auto"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="m_-7545817514943267602quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
oVirt version: 4.1.8<br><br>
Thanks<br>
Matthias<br><br>
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