All,
Edison Su, Min Chen, Animesh Chaturvedi, and myself met via teleconference on
11 June 2013 @ 1:30 PM EDT. The goal of the meeting was determine the path
forward for merging the object_store branch by the 4.2 freeze date, 30 June
2013. The conversation focused on the following topics:
* Staging area mechanism
* Removing dependencies from the Storage to the Hypervisor layer
* Dependencies of other patches on object_store
* QA's desire to start testing the patch ASAP
Min, Edison, and I agreed that the staging mechanism must age out files and use
a reference count to ensure that file in-use are not prematurely purged. While
we agree that some form of reservation system is required, Edison is concerned
that it will be too conservative and create bottlenecks.
As we delved deeper into the subject of the storage to hypervisor dependencies
and the reservation mechanism, we determined that NFS storage would still need
to be the size of the secondary storage data set. Since the hypervisor layer
has not been completely fitted to the new storage layer, NFS would be still
required for a number of operations. Based on this realization, we decided to
de-scope the staging mechanism, and leave the 4.2 object store functionality
the same as 4.1. Therefore, NFS will remain the secondary storage of record,
and object storage will serve as backup/multi-zone sync. In 4.3, we will fit
the hypervisor layer for the new storage layer which will allow object stores
to server as secondary storage. This work will include removing the storage to
hypervisor dependencies. For 4.2, Edison and Min have implemented the critical
foundation necessary to establish our next generation storage layer. There
simply was not enough time in this development cycle to make these changes and
fit the hypervisor layer.
Due to the size of the patch, Animesh voiced QA's concerned regarding test
scope and impact. As such, we want to get the merge completed as soon as
possible to allow testing to begin. We discussed breaking up the patch, but we
could not devise a reasonable set of chunks there were both isolated and
significantly testable. Therefore, the patch can only be delivered in its
current state. We also walked through potential dependencies between the
storage framework changes and the solidfire branch. It was determined that
these two merges could occur independently.
Finally, Animesh is going to setup a meeting at Citrix's Santa Clara office on
26 June 2013 (the day after Collab ends) to discuss the path forward for 4.3
and work through a high-level design/approach to fitting the hypervisor layer
to exploit the new storage capabilities. Details will be published to the dev
mailing list.
Thanks,
-John
On Jun 11, 2013, at 2:08 AM, Min Chen <[email protected]> wrote:
> It is 11th June. John is not free between 9:15am to 10am, that is why we
> schedule it at 10:30am.
>
> Thanks
> -min
>
> On 6/10/13 10:52 PM, "Nitin Mehta" <[email protected]> wrote:
>
>> Hi Min,
>> When you say tomorrow, what date is it 11th June or 12th ? Can the time be
>> preponed by an hour please - its too late here ?
>>
>> Thanks,
>> -Nitin
>>
>> On 11/06/13 11:06 AM, "Min Chen" <[email protected]> wrote:
>>
>>> Hi there,
>>>
>>> To reach consensus on some remaining NFS cache issues on object_store
>>> storage refactor work in a more effective manner, John, Edison and I have
>>> scheduled a GoToMeeting tomorrow to discuss them over the phone, any
>>> interested parties are welcome to join and brainstorm. Here are detailed
>>> GTM information:
>>>
>>> Meeting Time: 10:30 AM 12:30 PM PST
>>>
>>> Meeting Details:
>>>
>>> 1. Please join my meeting.
>>> https://www1.gotomeeting.com/join/188620897
>>>
>>> 2. Use your microphone and speakers (VoIP) - a headset is recommended.
>>> Or, call in using your telephone.
>>>
>>> United States: +1 (626) 521-0017
>>> United States (toll-free): 1 877 309 2070
>>>
>>> Access Code: 188-620-897
>>> Audio PIN: Shown after joining the meeting
>>>
>>> Meeting ID: 188-620-897
>>>
>>> GoToMeeting®
>>> Online Meetings Made Easy®
>>>
>>> Not at your computer? Click the link to join this meeting from your
>>> iPhone®, iPad® or Android® device via the GoToMeeting app.
>>>
>>> Thanks
>>> -min
>>
>
