<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">matthias.leopold@meduniwien.ac.at</a>> wrote:<br type="attribution"><blockquote class="quote" 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="quote" 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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