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From Ivan Rodriguez <ivan...@gmail.com>
Subject Re: KVM snapshot process
Date Wed, 04 Jun 2014 07:32:21 GMT
What is the purpose of doing this

qemu-img convert -f qcow2 -O qcow2 -s

KVM is using qcow2 this is the bit that is slowing this whole process




On Wed, Jun 4, 2014 at 5:30 PM, Ivan Rodriguez <ivanoch@gmail.com> wrote:

> You are absolutely right
>
> root     12348  2284  0 14:45 ?        00:00:00 bash
> /usr/share/cloudstack-common/scripts/storage/qcow2/managesnapshot.sh -b
> /mnt/5ffe8656-f987-3fcb-b71d-7dd1ed19e839/6ea271b1-2f95-4421-bca7-65b099c0577f
> -n 8b50e8dc-16a7-4948-99c0-e6d1751d6db5 -p
> /mnt/0b383db5-9f31-3760-873d-9ac05f349860/snapshots/3/144 -t
> 8b50e8dc-16a7-4948-99c0-e6d1751d6db5
> root     12358 12348  2 14:45 ?        00:03:39 qemu-img convert -f qcow2
> -O qcow2 -s 8b50e8dc-16a7-4948-99c0-e6d1751d6db5
> /mnt/5ffe8656-f987-3fcb-b71d-7dd1ed19e839/6ea271b1-2f95-4421-bca7-65b099c0577f
> /mnt/0b383db5-9f31-3760-873d-9ac05f349860/snapshots/3/144/8b50e8dc-16a7-4948-99c0-e6d1751d6db5
>
>
> Cheers
>
>
>
> On Wed, Jun 4, 2014 at 5:27 PM, Ivan Rodriguez <ivanoch@gmail.com> wrote:
>
>> 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
>>>
>>> D: +44 20 3603 0542<tel:+442036030542> | S: +44 20 3603 0540<tel:
>>> +442036030540> | M: +447968161581<tel:+447968161581>
>>>
>>> geoff.higginbottom@shapeblue.com<mailto:geoff.higginbottom@shapeblue.com>
>>> | www.shapeblue.com<htp://www.shapeblue.com/> | Twitter:@cloudstackguru<
>>> https://twitter.com/#!/cloudstackguru>
>>>
>>> ShapeBlue Ltd, 53 Chandos Place, Covent Garden, London, WC2N
>>> 4HS<x-apple-data-detectors://5>
>>>
>>>
>>> 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
>>> Find out more about ShapeBlue and our range of CloudStack related
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>>
>>
>

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