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From Ivan Rodriguez <ivan...@gmail.com>
Subject Re: KVM snapshot process
Date Wed, 04 Jun 2014 07:27:39 GMT
Hi Geoff,

What if the VM is stopped and not running anywhere ?
which is my case.

We have 10 GB LACP and jumbo frames.

Cheers



On Wed, Jun 4, 2014 at 5:02 PM, Geoff Higginbottom <
geoff.higginbottom@shapeblue.com> wrote:

> Ivan,
>
> The Host actually copies the image to Sec Storage,  if this is very slow
> have you considered dedicating some NICs and configuring the CloudStack
> 'Storage' network and enabling Jumbo Frames etc.
>
> Regards
>
> Geoff Higginbottom
> CTO / Cloud Architect
>
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>
> geoff.higginbottom@shapeblue.com<mailto:geoff.higginbottom@shapeblue.com>
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>
> On 4 Jun 2014, at 07:19, "Ivan Rodriguez" <ivanoch@gmail.com<mailto:
> ivanoch@gmail.com>> wrote:
>
> Dear Cloudstack users,
>
> Can someone explain me roughly the process of creating an snapshot in KVM ?
>
> The process takes a very long time, the speed at what the qcow2 file is
> copied from primary to secondary storage is extremely slow, on the storage
> level
> I can see is around 4 Mbps but I know our primary storage and secondary can
> dump data faster than that
>
> So far this is what I know
>
>     Step
>            1.- Pause the VM in the host
>            2.- Create the snapshot of the qcow2 files using qemu-img
>            3.- Backup the image into secondary storage
>
> So my question is who is actually copying that file over to secondary
> storage ?
> I've checked the secondary storage vm and it doesn't look like its playing
> any role during this process.
>
> Thanks in advance
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