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Re: Snapshots only on Primary Storage feature


Suresh,


With this new merged  PR, is it possible to disable the backup to secondary completely? I can't tell from the reference spec and we're not on a 4.10/4.11 base yet.

For the record, in the instances where a volume or template from snapshot was required, the backup image was copied on demand to secondary.

In an ideal world, secondary storage wouldn't even be involved in most of these options, instead using the native clone features of the underlying storage.


- Si

________________________________
From: Suresh Kumar Anaparti <sureshkumar.anaparti@xxxxxxxxx>
Sent: Thursday, May 17, 2018 1:37 PM
To: dev@xxxxxxxxxxxxxxxxxxxxx
Cc: Nathan Johnson
Subject: Re: Snapshots only on Primary Storage feature

Hi Glen / Si,

In PR# 1697, the global setting *snapshot.backup.rightafter* if set to
true, it'll be the default behaviour and snapshot is copied to the
secondary storage. If set to false, then the snapshot state transitions are
mocked and Snapshot would be in BackedUp state even though it is not really
in Secondary storage, which doesn't make sense. Also, that will enable to
create a volume or template from the snapshot, which will obviously fail.

This behavior was changed with the PR
https://github.com/apache/cloudstack/pull/2081. There is a clear separation
of create and backup volume snapshot operations. The global setting
*snapshot.backup.rightafter* has been removed in PR# 2081.

-Suresh

On Thu, May 17, 2018 at 8:40 PM, Simon Weller <sweller@xxxxxxx.invalid>
wrote:

> Glen,
>
>
> This feature was implemented in 4.9 by my colleague Nathan Johnson.  You
> enable it by changing the global setting  snapshot.backup.rightafter to
> false.
>
>
> The PR is reference here: https://github.com/apache/cloudstack/pull/1697
>
>
> We have the exact same use case as you, as we also use Ceph.
>
>
> - Si
>
>
> ________________________________
> From: Glen Baars <glen@xxxxxxxxxxxxxxxxxxxxxx>
> Sent: Thursday, May 17, 2018 9:46 AM
> To: dev@xxxxxxxxxxxxxxxxxxxxx
> Subject: Snapshots only on Primary Storage feature
>
>
> Hello Devs,
>
>
>
> I have been thinking about a feature request and want to see what people
> think about the use case.
>
>
>
> We use KVM + Ceph RBD as storage.
>
>
>
> Currently, when a client takes a snapshot, Cloudstack takes a Ceph
> snapshot and then uses qemu-img to export to secondary storage. This
> creates a full backup of the server. Clients want to use this as a daily
> snapshot and it isn’t feasible due to the space requirements.
>
>
>
> We would like create the snapshot only on primary storage. It is
> replicated offsite and fault tolerant. I can see that the download snapshot
> and create template features may be an issue.
>
>
>
> I have seen the below features in the recent releases and wondered if this
> was the direction that the development was going.
>
> Separation of volume snapshot creation on primary storage and backing
> operation on secondary storage.
>
> Bypass secondary storage template copy/transfer for KVM.
>
> Kind regards,
>
> Glen Baars
>
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