Open Stack

Thanks John.

On Tue, Feb 20, 2018 at 11:53 PM, John Dickinson <me at not.mn> wrote:

> For example, you can have 3 replicas stored in a global cluster and get
> dispersion across multiple geographic regions. But it's all one logical
> cluster.
>
> With container sync, you've got separate clusters with their own
> durability characteristics. So you would have eg 3 replicas in each
> cluster, meaning 6x in the data that is synced between two clusters.
>
> --John
>
>
> On 18 Feb 2018, at 22:11, aRaviNd wrote:
>
> Thanks John.
>
> You mentioned sync process in global clusters is more efficient. Could you
> please let me know how sync process is more efficient in global clusters
> than container sync?
>
> Aravind
>
> On Wed, Feb 14, 2018 at 9:10 PM, John Dickinson <me at not.mn> wrote:
>
>> A global cluster is one logical cluster that durably stores data across
>> all the available failure domains (the highest level of failure domain is
>> "region"). For example, if you have 2 regions (ie DCs)and you're using 4
>> replicas, you'll end up with 2 replicas in each.
>>
>> Container sync is for taking a subset of data stored in one Swift cluster
>> and synchronizing it with a different Swift cluster. Each Swift cluster is
>> autonomous and handles it's own durability. So, eg if each Swift cluster
>> uses 3 replicas, you'll end up with 6x total storage for the data that is
>> synced.
>>
>> In most cases, people use global clusters and are happy with it. It's
>> definitely been more used than container sync, and the sync process in
>> global clusters is more efficient.
>>
>> However, deploying a multi-region Swift cluster comes with an extra set
>> of challenges above and beyond a single-site deployment. You've got to
>> consider more things with your inter-region networking, your network
>> routing, the access patterns in each region, your requirements around
>> locality, and the data placement of your data.
>>
>> All of these challenges are solvable, of course. Start with
>> https://swift.openstack.org and also feel free to ask here on the
>> mailing list or on freenode IRC in #openstack-swift.
>>
>> Good luck!
>>
>> John
>>
>>
>> On 14 Feb 2018, at 6:55, aRaviNd wrote:
>>
>> Hi All,
>>
>> Whats the difference between container sync and global cluster? Which
>> should we use for large data set of 100 Tb ?
>>
>> Aravind
>>
>> On Feb 13, 2018 7:52 PM, "aRaviNd" <ambadiaravind at gmail.com> wrote:
>>
>> Hi All,
>>
>> We are working on implementing Openstack swift replication and would like
>> to know whats the better approach, container sync or global cluster, on
>> what scenario we should choose one above the another.
>>
>> Swift cluster will be used as a backend for web application deployed on
>> multiple regions which is configured as active passive using DNS.
>>
>> Data usage can grow upto 100TB starting with 1TB. What will be better
>> option to sync data between regions?
>>
>> Thank You
>>
>> Aravind M D
>>
>>
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