[ovirt-devel] Gluster Volume Snapshots - Feature review

Tue Dec 30 12:09:51 UTC 2014

Thanks Einav for the detailed review and your comments.
Find below the comment inline.

Will update the wiki accordingly and circulate.

Team, please provide your thoughts (if conflicting) on this.

Thanks and Regards,
Shubhendu

On 12/30/2014 05:33 AM, Einav Cohen wrote:
> Hi Shubhendu,
>
> First of all - very detailed wiki pages (I focused mainly on the
> User Experience part) - nicely done.
>
> I have a couple of comments / suggestions regarding the GUI:
>
> Snapshot action-group:
>
> - from the wiki page:
> """
> A new action-group "Snapshot" would be introduced under actions
> for a volume.
> """
> I assume that you will implement it similarly to the "Power Management"
> action-group (on Hosts main tab) or the "Profiling" action-group (on
> the Volumes tab), i.e. with a drop-down-like styling
> [http://i.imgur.com/eWRg6o8.png]?

Yes. That's correct.

> - If the Snapshot-related actions are expected to be core/critical in
> the Volumes-related workflows, it makes sense to put them in the main-
> tab, but please consider adding them to the Snapshots sub-tab as well,
> in order to be consistent with other similar oVirt workflows.

Yes that's true for most of the cases. But having Options setting from 
sub-tab, not sure if that's correct. May be "New" is fine.

> New Snapshot dialog -> Schedule section:
>
> - I suggest to implement the time-interval selection with a drop-down,
> rather than a radio-button group; it is more consistent with e.g.
> event-repeat scheduling in a calendar [http://i.imgur.com/y9Gn3wq.png],
> it will save real-estate within the dialog and it will be more easily
> readable for the user.

That's a good suggestion. Will do this.

> - to my understanding, the New Snapshot functionality doesn't have to
> be recurrent; however, there isn't any way to "disable" the recurring
> aspect. Here are some suggestions to how this should be added:
> http://i.imgur.com/4j7hvRY.png

Once scheduled the only way to stop snapshot creation is to provide an 
end date.

> Option 3 is my personal favorite - it is the simplest, and is consistent
> with Calendear-scheduling UI. Option 1 is my least favorite, however it
> is consistent with e.g. the "Enable Power Management" UI within the "New
> Host" dialog.

Option-3 looks good to me as well. Should be doable I feel.

> Snapshots -> Options:
>
> - I think that there are a couple of problematic issues with this dialog:
>
>    * the different functionality of this dialog when a Volume is selected
> vs. when no Volume is selected may be unclear to the user.

Agree

>    
>    * the fact that we can update Cluster-related parameters (which
> potentially affects *all* volumes in that Cluster) within a specific
> Volume-context dialog is a bit risky - and we don't have anything similar
> to that anywhere in the application today IIRC.
>
> my recommendations:
>
>    * have separate "Options - Cluster" and "Options - Volume" actions;
> "Options - Cluster" should always be enabled.
> "Options - Volume" should be enabled only when a Volume is selected.

Accept

>    * Seehttp://i.imgur.com/pfRpjrH.png  for my suggestion for "Cluster
> Options" vs. "Volume Options". Note that from the "Volume Options"
> dialog, you may allow editing the Cluster Options by clicking on the
> link-button, which will either (a) open the "Cluster Options" dialog
> on top or (b) allow editing the Cluster Values inline within the
> already-open dialog - this should be accompanied with a clear note to
> the user that he is editing Cluster-related parameters from the current
> (Volume) context, which may affect *all* Volumes in that Cluster.
> Also note that in my suggestion, the user can conveniently see both the
> Volume values and the Cluster Values side-by-side at once, for reference.

Accept

> Snapshots -> Schedule:
>
> - to my understanding, this should be very similar (or identical) to the
> New Snapshot functionality? if so, we may want to simply open the "New
> Snapshot" dialog focused on the "Schedule" side-section (rather than the
> 'General' side-section, maybe already pre-populated with some values in
> the 'General' side-section (which will still be editable by the user) and
> something already pre-selected in the (focused) "Schedule" section.
>
> please let me know whether you think these can/should be incorporated
> into the design, and/or if you have any comments or questions.

Accept. The snapshot create dialog itself can be used here.

> thanks.
>
> ----
> Regards,
> Einav
>
> ----- Original Message -----
>> From: "Shubhendu Tripathi"<shtripat at redhat.com>
>> To:devel at linode01.ovirt.org,jhernand at redhat.com, "Michael Pasternak"<mpastern at redhat.com>
>> Sent: Monday, November 10, 2014 1:52:40 AM
>> Subject: [ovirt-devel] Gluster Volume Snapshots - Feature review
>>
>> Hi All,
>>
>> Please help us to review the design of Gluster Volume Snapshots in oVirt,
>>
>> Here are two design on wiki page
>>
>> General Feature Design
>> http://www.ovirt.org/Features/GlusterVolumeSnapshots
>>
>> Detailed Design
>> http://www.ovirt.org/Features/Design/GlusterVolumeSnapshots
>>
>> We target it in ovirt 3.6 release.
>>
>> Marked Juan/Michael specifically for REST review.
>>
>> Best Regards,
>> Shubhendu Tripathi
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