6:33 p.m.
oVirt Node - 3.5 - 0.999.201504280931.el7.centos
Using our shared storage via baremetal (stock CentOS 7) -> iscsi, I can
successfully issue fstrim commands. With oVirt at the VM level, even
with direct LUNS, trim commands are not supported despite having the LVM
config in the VMs set up to allow it.
Thanks
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9:24 p.m.
----- Original Message -----
oVirt Node - 3.5 - 0.999.201504280931.el7.centos
Using our shared storage via baremetal (stock CentOS 7) -> iscsi, I can
successfully issue fstrim commands. With oVirt at the VM level, even
with direct LUNS, trim commands are not supported despite having the LVM
config in the VMs set up to allow it.
Hey,
IIUIC you try to get discard working for VMs? That means that if fstrim is
used inside the VM, that it is getting passed down?
The command line needed for qemu to support discards is:
$ qemu … -drive if=virtio,cache=unsafe,discard,file=<disk> …
I'm not sure which qemu disk drivers/busses support this, but at least virtio does
so.
I'm using it for development.
You could try a vdsm hook to modify the qemu command which is called when the VM is
spawned.
Let me know if you can come up with a hook to realize this!
Greetings
fabian
9:56 p.m.
Once upon a time, Fabian Deutsch <fdeutsch(a)redhat.com> said:
I'm not sure which qemu disk drivers/busses support this, but at
least virtio does so.
I'm using it for development.
Using CentOS 7, I think qemu-kvm only supports discard on virtio-scsi
drives using the raw format. Discard on qcow2 images is supported for
newer versions of qemu-kvm.
oVirt uses virtio by default; you can switch to virtio-scsi. However,
if you use thin-provisioned disks, oVirt uses qcow2 format, so discard
is not supported with CentOS 7's version of qemu-kvm.
--
Chris Adams <cma(a)cmadams.net>
11:18 p.m.
On 06/10/2015 03:24 PM, Fabian Deutsch wrote:
----- Original Message -----
> oVirt Node - 3.5 - 0.999.201504280931.el7.centos
>
> Using our shared storage via baremetal (stock CentOS 7) -> iscsi, I can
> successfully issue fstrim commands. With oVirt at the VM level, even
> with direct LUNS, trim commands are not supported despite having the LVM
> config in the VMs set up to allow it.
Hey,
IIUIC you try to get discard working for VMs? That means that if fstrim is
used inside the VM, that it is getting passed down?
The command line needed for qemu to support discards is:
$ qemu … -drive if=virtio,cache=unsafe,discard,file=<disk> …
I'm not sure which qemu disk drivers/busses support this, but at least virtio does
so.
I'm using it for development.
You could try a vdsm hook to modify the qemu command which is called when the VM is
spawned.
Let me know if you can come up with a hook to realize this!
There's this hook in code review intended to do so:
https://gerrit.ovirt.org/#/c/29770/
Greetings
fabian
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Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
6:11 p.m.
Looks like I need to learn how to use VDSM hooks. I'll start there.
Thanks everyone.
On 06/10/2015 04:18 PM, Amador Pahim wrote:
On 06/10/2015 03:24 PM, Fabian Deutsch wrote:
> ----- Original Message -----
>> oVirt Node - 3.5 - 0.999.201504280931.el7.centos
>>
>> Using our shared storage via baremetal (stock CentOS 7) -> iscsi, I can
>> successfully issue fstrim commands. With oVirt at the VM level, even
>> with direct LUNS, trim commands are not supported despite having the LVM
>> config in the VMs set up to allow it.
> Hey,
>
> IIUIC you try to get discard working for VMs? That means that if
> fstrim is
> used inside the VM, that it is getting passed down?
>
> The command line needed for qemu to support discards is:
>
> $ qemu … -drive if=virtio,cache=unsafe,discard,file=<disk> …
>
> I'm not sure which qemu disk drivers/busses support this, but at least
> virtio does so.
> I'm using it for development.
>
> You could try a vdsm hook to modify the qemu command which is called
> when the VM is spawned.
>
> Let me know if you can come up with a hook to realize this!
There's this hook in code review intended to do so:
https://gerrit.ovirt.org/#/c/29770/
>
> Greetings
> fabian
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
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4 comments
4 participants
participants (4)
-
Amador Pahim -
Chris Adams -
Chris Jones - BookIt.com Systems Administrator -
Fabian Deutsch