Does it help if you edit the VM and under Resource Allocation enable IO threads. ?
Zip From: <users-boun...@ovirt.org> on behalf of Yaniv Kaul <yk...@redhat.com> Date: Saturday, January 20, 2018 at 12:54 PM To: Matthias Leopold <matthias.leop...@meduniwien.ac.at> Cc: Wolfgang Lendl <wolfgang.le...@meduniwien.ac.at>, Ovirt Users <users@ovirt.org> Subject: Re: [ovirt-users] VirtIO-SCSI and viodiskcache custom property On Jan 19, 2018 3:29 PM, "Matthias Leopold" <matthias.leop...@meduniwien.ac.at> wrote: > Hi, > > is there a reason why the viodiskcache custom property isn't honored when > using VirtIO-SCSI? > > On a Cinder (Ceph) disk "viodiskcache=writeback" is ignored with VirtIO-SCSI > and honored when using VirtIO. > > 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" > > We actually want to use "viodiskcache=writeback" with Cinder (Ceph) disks. 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. Y. > > oVirt version: 4.1.8 > > Thanks > Matthias > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >
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