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From Ivan Rodriguez <ivan...@gmail.com>
Subject Re: KVM snapshot process
Date Wed, 04 Jun 2014 07:30:28 GMT
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 services
>>
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