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From Geoff Higginbottom <geoff.higginbot...@shapeblue.com>
Subject Re: Xen - Deploying servers from a template
Date Wed, 29 Apr 2015 10:28:29 GMT
Hi Yuri,

Thanks for adding some more detail to the thread.

You say that the prepare template api does not work for you, I have not had the same experience
so could you share more details and ideally log a jira ticket 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>

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On 29 Apr 2015, at 14:10, Yuri Kogun <ykogun@outlook.com<mailto:ykogun@outlook.com>>
wrote:

Just wanted to add  from the personal experience that the process of copying template is sequential
as the secondary storage can be mounted only on one host in the cluster (due to SR  locking
issue)  .  We use local storage in production and normally prepare the template by starting
the vm with is on every host in the cluster in the quiet time. The prepare_template API call
does not work properly.
The other problem is that the XEN server host is unusable until the template copy is finished
and all other calls to start VM's on the host will have to wait.

Best regards
Yuri Kogun
----------------------------------------
From: geoff.higginbottom@shapeblue.com<mailto:geoff.higginbottom@shapeblue.com>
To: users@cloudstack.apache.org<mailto:users@cloudstack.apache.org>
Subject: Re: Xen - Deploying servers from a template
Date: Tue, 28 Apr 2015 11:58:55 +0000

The first time a template is used, it is copied from Secondary to Primary,
then the VM is created, and in the case of XenServer is created as a
Œlinked clone¹. This linking of the VM to the Template means that whilst
there are VMs allocated to Primary Storage, the templates that the VMs are
using will always remain on Primary Storage.

If a 2nd VM is created based on the same template, the template is already
on Primary Storage so is not copied again.

If all the VMs which were using a Template are deleted or migrated to
alternate storage, the Template is no longer required and will be deleted
from Primary Storage.

This automatic clean up can be disabled by updating the global setting
storage.template.cleanup.enabled

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<http://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 28/04/2015 15:13, "cs user" <acldstkusr@gmail.com<mailto:acldstkusr@gmail.com>>
wrote:

Hi All,

Quick question with regards to xenserver and deploying a cloudstack
instance from a template stored within secondary storage.

In this case it is secondary storage using NFS and deploying to local disk
on the xenserver. (cloudstack 4.3, Xen 6.0.1)

I believe this script is used to pull down the template:
/opt/cloud/bin/copy_vhd_from_secondarystorage.sh

I'm seeing a big variation when deploying 3 servers, for example. 2 of the
servers might start very quickly and one may take longer.

Is there any caching of the template taking place on the xen host its
self?
If a host has previously deployed a template, and is then asked to deploy
a
new instance using the template, will it have to go back to secondary
storage again or can it use a local cache of the vhd file?

Many thanks in advance for any responses.

Cheers!

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Find out more about ShapeBlue and our range of CloudStack related services

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This email and any attachments to it may be confidential and are intended solely for the use
of the individual to whom it is addressed. Any views or opinions expressed are solely those
of the author and do not necessarily represent those of Shape Blue Ltd or related companies.
If you are not the intended recipient of this email, you must neither take any action based
upon its contents, nor copy or show it to anyone. Please contact the sender if you believe
you have received this email in error. Shape Blue Ltd is a company incorporated in England
& Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated
under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated
in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue SA Pty Ltd is a company
registered by The Republic of South Africa and is traded under license from Shape Blue Ltd.
ShapeBlue is a registered trademark.

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