On Mon, Jul 30, 2018, 9:34 AM Suchitra Herwadkar <Suchitra.Herwadkar@veritas.com> wrote:

Hi Pavan
Is it possible to discuss this over a call/webex?
It will help us put up our perspective and we can discuss options.

Let us know!
-Suchitra

On 7/26/18, 6:44 AM, "Suchitra Herwadkar" <Suchitra.Herwadkar@veritas.com> wrote:

Hi Ondra and team

Thanks for helping us out on below answers.

We recently have reported bug using Bugzilla
https://bugzilla.redhat.com/show_bug.cgi?id=1608452

This is regarding download of snapshot disk, having multiple snapshots before creation of snapshot for backup. We have observed that in case of multiple snapshots, the caller needs to keep track of the chain and have them in the same order while uploading them back.

Is this a correct understanding?
We were looking for an alternate approach of downloading entire disk using snapshot ID XXX, which is created for backup purpose, with REST API (i.e. using proxy_url and signed ticket). We could achieve this if this only if it was a first snapshot when the actual size is same as the provisional size and not for interleaved snapshots.

Kindly advise if that's possible.

Reference Articles:
https://ovirt.org/develop/release-management/features/storage/backup-restore-disk-snapshots/
https://bugzilla.redhat.com/show_bug.cgi?id=1405805

Appreciate your time!

Thanks
Suchitra

On 7/18/18, 8:13 PM, "Ondra Machacek" <omachace@redhat.com> wrote:

On 07/18/2018 03:57 PM, Martin Perina wrote:
> Ondro/Ravi/Tal, could you please reply to below questions?
>
>
> On Tue, Jul 17, 2018 at 3:59 PM, Suchitra Herwadkar
> <Suchitra.Herwadkar@veritas.com <mailto:Suchitra.Herwadkar@veritas.com>>
> wrote:
>
> Hello oVirt Development team____
>
> __ __
>
> We had some more questions as we continue working on REST APIs.
> Kindly help us answer the same. ____
>
> __ __
>
> What is the expiry of generated access_token? ____
>
> *Description: *We have observed that the output of
> *“/ovirt-engine/sso/oauth/token” *contains a field *“exp”* which
> points to the date when the access_token is going to expire. In our
> case, we have seen this value to be 8 days later. However, the
> access_token gets expired within an hour. We would like to
> understand exactly what is the lifetime of this access_token? What
> we are seeing is something unexpected? Is this value configurable by
> users?

I know you can increase user session timeout in engine-config property
called 'UserSessionTimeOutInterval', by default it's one hour (note you
must restart ovirt-engine in order to take effect of the change). How
the field 'exp' is related, I don't exactly know. Ravi?

>
> ____
>
> __ __
>
> How to retrieve the ‘creation_status’ of the snapshot through REST
> API? ____
>
> *Description: *We see there is a way to get it as part of query
> snapshot API viz
> /ovirt-engine/api/vms/<vm_id>/snapshots/<snapshot_id> where the
> response contains detailed information of snapshot, along with the
> field *"snapshot_status": "ok". *Just wanted to check if there is
> another API explicitly devoted to getting the creation status so
> that we can poll it periodically to know the status?____
>
> At least in CURL, we see there is some URL to fetch the creation
> status like this /ovirt-engine/api/<vm_id>/snapshots/<snapshot_id>
> /creation_status/<WHAT_IS_THIS_ID?>"____

The link to creation_status is provided in the response of create
snapshot operation, if you do it asynchronously. But it's not recomended
to use it that way. As you've described polling the 'snapshot_status'
attribute is the best way of waiting for operation to finish.

>
> __ __
>
> *Q.* How to call a DELETE snapshot API with ‘async’ operation as
> ‘false’? ____
>
> *Description: *The documentation for DELETE snapshot API mentions
> that the DELETE operation can be invoked synchronously or
> asynchronously based on the value of the parameter ‘async’. I wanted
> to perform DELETE operation synchronously, so tried providing this
> parameter in the body as “<async>false<async>”, still it was doing
> the operation asynchronously. Please advise on the correct usage of it.

Same as above the sync/async is incorrect here. Both operations behave
the same, but async will return the 'creation_status' which you can poll
to get the result, but every operation is implemented differently so I
wouldn't recomend to use it.

If you want to be sure the snapshost is deleted I the best way is the
run DELETE /api/vms/123/snapshots/456, and then do polling of /api/vms
/123/snapshots/456 until it returns 404. This operation unfortunatelly
can't be invoked synchronously.

>
> ____
>
> __ __
>
> Thanks____
>
> Suchitra ____
>
> __ __
>
> __ __
>
> *From: *Ranjit DSouza <Ranjit.DSouza@veritas.com
> <mailto:Ranjit.DSouza@veritas.com>>
> *Date: *Tuesday, July 3, 2018 at 1:43 PM
> *To: *"devel@ovirt.org <mailto:devel@ovirt.org>" <devel@ovirt.org
> <mailto:devel@ovirt.org>>
> *Cc: *DL-VTAS-ENG-NBU-EverestFalcons
> <DL-VTAS-ENG-NBU-EverestFalcons@veritas.com
> <mailto:DL-VTAS-ENG-NBU-EverestFalcons@veritas.com>>, Sudhakar
> Paulzagade <Sudhakar.Paulzagade@veritas.com
> <mailto:Sudhakar.Paulzagade@veritas.com>>, Pavan Chavva
> <pchavva@redhat.com <mailto:pchavva@redhat.com>>, Navin Tah
> <Navin.Tah@veritas.com <mailto:Navin.Tah@veritas.com>>
> *Subject: *Image Transfer mechanism queries/API support____
>
> __ __
>
> Hello oVirt Development team____
>
> ____
>
> We had a conversation with Pavan Chavva for supporting RHV. He had
> suggested to contact you with queries related to oVirt APIs we plan
> to use.____
>
> We have following queries:____
>
> ____
>
> __1.__While downloading a snapshot disk, can we identify allocated
> extents and download only those using oVirt API? We are able to
> download the disk using the Image Transfer API mechanism. ____
>
> However, this method downloads the entire disk including the
> non-allocated extents, which is a performance overhead. If this
> functionality does not exist at this point will it be available in
> near future?____
>
> ____
>
> __2.__Is there an alternate method to transfer a snapshot to and
> from RHV storage? Are there other methods such as NFS share where we
> can download snapshot image to and from RHV storage?____
>
> ____
>
> Thanks____
>
> Ranjit____
>
> Team EverestFalcons____
>
>
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> Martin Perina
> Associate Manager, Software Engineering
> Red Hat Czech s.r.o.