3:28 p.m.
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.
oVirt version: 4.1.8
Thanks
Matthias
8:54 p.m.
On Jan 19, 2018 3:29 PM, "Matthias Leopold" <
matthias.leopold(a)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(a)ovirt.org
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6:53 a.m.
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Does it help if you edit the VM and under Resource Allocation =AD enable IO
threads. ?
Zip
From: <users-bounces(a)ovirt.org> on behalf of Yaniv Kaul <ykaul(a)redhat.com>
Date: Saturday, January 20, 2018 at 12:54 PM
To: Matthias Leopold <matthias.leopold(a)meduniwien.ac.at>
Cc: Wolfgang Lendl <wolfgang.lendl(a)meduniwien.ac.at>, Ovirt Users
<users(a)ovirt.org>
Subject: Re: [ovirt-users] VirtIO-SCSI and viodiskcache custom property
On Jan 19, 2018 3:29 PM, "Matthias Leopold"
<matthias.leopold(a)meduniwien.ac.at> wrote:
Hi,
=20
is there a reason why the viodiskcache custom property isn't honored when
using VirtIO-SCSI?
=20
On a Cinder (Ceph) disk "viodiskcache=3Dwriteback" is ignored with VirtIO-S=
CSI
and honored when using VirtIO.
=20
On an iSCSI disk "viodiskcache=3Dwriteback" is ignored with VirtIO-SCSI and=
the
VM can't be started when using VirtIO with "unsupported
configuration: na=
tive
I/O needs either no disk cache or directsync cache mode, QEMU will
fallba=
ck to
aio=3Dthreads"
=20
We actually want to use "viodiskcache=3Dwriteback" 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.=20
=20
oVirt version: 4.1.8
=20
Thanks
Matthias
=20
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
=20
=20
--B_3599420040_119811012
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charset="ISO-8859-1"
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<html><head></head><body style=3D"word-wrap: break-word;
-webkit-nbsp-mode: s=
pace; -webkit-line-break: after-white-space; 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=
<br></div><div>Zip</div><div><span
class=3D"Apple-style-span" style=3D"font-siz=
e: 12px; font-family:
Verdana, Helvetica,
Arial;"><br></span></div></div><di=
v><span class=3D"Apple-style-span" style=3D"font-size: 12px;
font-family: Verdan=
a, Helvetica, Arial;"><br></span></div><div><span
class=3D"Apple-style-span" s=
tyle=3D"font-size: 12px; font-family: Verdana, Helvetica,
Arial;"><br></span><=
/div><span id=3D"OLK_SRC_BODY_SECTION"><div
style=3D"font-family:Calibri; font-s=
ize:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-L=
EFT: 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=3D"font-weight:bold">From: </span>
<<a href=3D"mailto:users-bou=
nces@ovirt.org">users-bounces(a)ovirt.org</a>&gt; on behalf of Yaniv Kaul
<=
<a
href=3D"mailto:ykaul@redhat.com">ykaul@redhat.com</a>><br><span
style=3D"f=
ont-weight:bold">Date: </span> Saturday, January 20, 2018 at 12:54
PM<br><sp=
an style=3D"font-weight:bold">To: </span> Matthias Leopold
<<a href=3D"mailto=
:matthias.leopold@meduniwien.ac.at">matthias.leopold@meduniwien.ac.at</a>>=
;<br><span style=3D"font-weight:bold">Cc: </span> Wolfgang
Lendl <<a href=3D"=
mailto:wolfgang.lendl@meduniwien.ac.at">wolfgang.lendl@meduniwien.ac.at</a>&=
gt;, Ovirt Users <<a
href=3D"mailto:users@ovirt.org">users@ovirt.org</a>>=
;<br><span style=3D"font-weight:bold">Subject: </span> Re:
[ovirt-users] VirtI=
O-SCSI and viodiskcache custom
property<br></div><div><br></div><div><meta h=
ttp-equiv=3D"Content-Type" content=3D"text/html;
charset=3Dutf-8"><div><div dir=3D"a=
uto"><div><br><div
class=3D"gmail_extra"><br><div class=3D"gmail_quote">On
Jan 1=
9, 2018 3:29 PM, "Matthias Leopold" <<a
href=3D"mailto:matthias.leopold@med=
uniwien.ac.at">matthias.leopold(a)meduniwien.ac.at</a>&gt; wrote:<br
type=3D"att=
ribution"><blockquote class=3D"quote" style=3D"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 u=
sing VirtIO-SCSI?<br><br>
On a Cinder (Ceph) disk "viodiskcache=3Dwriteback" is ignored with VirtIO-SCS=
I and honored when using VirtIO.<br><br>
On an iSCSI disk "viodiskcache=3Dwriteback" is ignored with VirtIO-SCSI and t=
he VM can't be started when using VirtIO with "unsupported configuration: na=
tive I/O needs either no disk cache or directsync cache mode, QEMU will fall=
back to aio=3Dthreads"<br><br>
We actually want to use "viodiskcache=3Dwriteback" with Cinder (Ceph)
disks.<=
br></blockquote></div></div></div><div
dir=3D"auto"><br></div><div dir=3D"auto">=
That's because on block storage we use native io and not threads. I assume t=
he hook needs to change to use native io in this case. </div><div
dir=3D"=
auto">Y. </div><div
dir=3D"auto"><br></div><div dir=3D"auto"><div
class=3D"gm=
ail_extra"><div class=3D"gmail_quote"><blockquote
class=3D"quote" style=3D"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>
______________________________<wbr>_________________<br>
Users mailing list<br><a href=3D"mailto:Users@ovirt.org"
target=3D"_blank">User=
s(a)ovirt.org</a><br><a
href=3D"http://lists.ovirt.org/mailman/listinfo/users" r=
el=3D"noreferrer"
target=3D"_blank">http://lists.ovirt.org/mailman<wbr>/...
/users</a><br><br><br></blockquote></div><br></div></div></div></div></div><=
/span></body></html>
--B_3599420040_119811012--
8:52 a.m.
On Mon, Jan 22, 2018 at 6:53 AM, Zip <plord(a)intricatenetworks.com> wrote:
Does it help if you edit the VM and under Resource Allocation –
enable IO
threads. ?
Confusingly, it has nothing to do with IO threads.
Y.
Zip
From: <users-bounces(a)ovirt.org> on behalf of Yaniv Kaul <ykaul(a)redhat.com>
Date: Saturday, January 20, 2018 at 12:54 PM
To: Matthias Leopold <matthias.leopold(a)meduniwien.ac.at>
Cc: Wolfgang Lendl <wolfgang.lendl(a)meduniwien.ac.at>, Ovirt Users <
users(a)ovirt.org>
Subject: Re: [ovirt-users] VirtIO-SCSI and viodiskcache custom property
On Jan 19, 2018 3:29 PM, "Matthias Leopold" <matthias.leopold@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(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
11:52 a.m.
Am 2018-01-20 um 19:54 schrieb Yaniv Kaul:
On Jan 19, 2018 3:29 PM, "Matthias Leopold"
<matthias.leopold(a)meduniwien.ac.at
<mailto:matthias.leopold@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.
Thank you, but i still don't quite get what's missing.
We want to use the combination of Cinder (Ceph) + cache=writeback +
VirtIO-SCSI. Would this be possible if aio=native was used (which is not
configurable)? With iSCSI storage you still get cache=none when using
VirtIO-SCSI and "viodiskcache=writeback" (and aio=native). Should i file
a bug report for the Cinder disk situation?
Thanks again
Matthias
2545
days inactive
2548
days old
4 comments
3 participants
participants (3)
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Matthias Leopold -
Yaniv Kaul -
Zip