[one-users] hotplug attach disk cache mode for kvm

[Rolandas Naujikas]

On 2013-01-23 14:55, Ruben S. Montero wrote:
> Hi,
>
> You can set cache if you are using the CLI, just create a disk
> attachment file
>
> with
>
> DISK = [ IMAGE_ID = #{image_id}, TARGET = #{target}, CACHE=default ]
>
> or
>
> DISK = [ IMAGE_ID = #{image_id}, DEV_PREFIX = #{bus}, CACHE=default ]

OK, it works. But sunstone/self service portals are missing fields for 
that to work.

> and then use it for onevm attachdisk. I agree, that it should probably
> honor the default in  vmm_exec_kvm.conf.

I'm also for it to honor TEMPLATE/CACHE parameter from image.
The same would be good for VM templates, so I don't need to write CACHE 
parameter into VM template.

Some images are volatiles, other could contain critical data.

Regards, Rolandas Naujikas

> I've filled an issue to improve this...
>
> http://dev.opennebula.org/issues/1737
>
> Cheers
>
>
>
> On Wed, Jan 23, 2013 at 1:07 PM, Rolandas Naujikas
> <rolandas.naujikas at mif.vu.lt <mailto:rolandas.naujikas at mif.vu.lt>> wrote:
>
>     Hi,
>
>     I'm testing disks hotplug for kvm VMs and I found that there are no
>     way to setup cache mode for such disks. I tried to put CACHE="none"
>     to image template, but it is not used in attach_disk (tested with
>     "rm -f "$ATTACH_FILE"" commented out).
>
>     We have CACHE="none" default in vmm_exec_kvm.conf, because for
>     virtio disks it is fast. CACHE=default is about one order slower.
>
>     Regards, Rolandas Naujikas
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>     --
>     Ruben S. Montero, PhD
>     Project co-Lead and Chief Architect
>     OpenNebula - The Open Source Solution for Data Center Virtualization
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>     <mailto:rsmontero at opennebula.org> | @OpenNebula
>