Azure Data Lake Storge gen2 with GRS - how to migrate back to primary region after failover?

Wojtek Kaminski 1

I am preparing a disaster recovery plan for the data lake storage gen 2 (DLS)storage account. What I'm not sure about is what the process of restoring the data lake to the primary region looks like.

after failover(Microsoft managed), the second region is becoming primary for DLS as LRS storage. the question is, once the primary region will back online, how to restore the DLS back to the primary region without the manual process of moving data? Is it somehow managed by Microsoft?

KranthiPakala-MSFT 46,512 Reputation points Microsoft Employee

2022-03-07T23:53:11.803+00:00

Hello @Wojtek Kaminski ,

Thanks for the question and using MS Q&A platform.

As we understand the ask here is that you would like to know how to restore the DLS back to primary region without manual process of moving data once the primary region is back online. Please correct me if I'm wrong.

At this point, we are reaching out to internal team to get additional information regarding this process and will keep you posted as soon as we hear back from the team.

Thank you
Wojtek Kaminski 1 Reputation point

2022-03-11T10:26:20.97+00:00

Hi @KranthiPakala-MSFT ,

Yes exactly, as you said I would like to know how to restore the DLS back to primary region without manual process of moving data once the primary region is back online

1 answer

KranthiPakala-MSFT 46,512 Reputation points Microsoft Employee

2022-03-14T22:40:17.557+00:00

Hello @Wojtek Kaminski ,

As per my conversation with internal team if Microsoft initiates a regional failover, the data in the original region has been deemed unrecoverable. Therefore, once a regional pair is available, the customer will need to update their replication type to a geo-redundant replication type. After the customer selected a geo-redundant replication type all of the data in their storage account will get replicated into their new secondary.

Hope this helps. Do let us know if you have any questions.

Thank you
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2 people found this answer helpful.
Wojtek Kaminski 1 Reputation point

2022-03-22T21:07:25.673+00:00

Hello @KranthiPakala-MSFT ,

Thank you for your answer but it's partially covering my question. In the scenario you described new secondary is the old primary( from the time before the disaster) but I wanted to restore back to the initial scenario - so the old primary will be my current primary and the secondary will play the same role.

I need this set up to support diagnostic settings export to a storage account which requires streaming the data to a storage account in the same region as diagnostic settings resource

Could you please cover above scenario?

KranthiPakala-MSFT 46,512 Reputation points Microsoft Employee

2022-03-22T23:05:34.497+00:00

Hello @Wojtek Kaminski ,

Thanks for your response.

In the scenario you described new secondary is the old primary( from the time before the disaster) but I wanted to restore back to the initial scenario - so the old primary will be my current primary and the secondary will play the same role.

Sorry, if my statement is confusing, let me clarify here again - When Microsoft initiates a regional failover, the data in the original (1st Primary) region has been deemed unrecoverable. Hence the second region becomes the current primary region. Therefore, once a regional pair is available, user will have to update their replication type to a geo-redundant replication type. Once after the user selected a geo-redundant replication type all of the data in their storage account (Current primary i.e, old secondary) will get replicated into their new secondary region.

I wanted to restore back to the initial scenario - so the old primary will be my current primary and the secondary will play the same role.

I don't think this is a possible scenario as your original secondary region will behave as your current primary and the new regional pair will act as your current secondary.

Please let me know if this clarifies or if you have further questions.

KranthiPakala-MSFT 46,512 Reputation points Microsoft Employee

2022-03-23T18:46:46.57+00:00

Hi there,

Just checking to see if my previous response was helpful? Do let us know if you have further questions.

Thanks

Wojtek Kaminski 1 Reputation point

2022-03-28T13:21:27.773+00:00

Hello,

could you please confirm this with the product group:
I don't think this is a possible scenario as your original secondary region will behave as your current primary and the new regional pair will act as your current secondary.
This is exactly what I need to achieve to restore back the initial configuration.

KranthiPakala-MSFT 46,512 Reputation points Microsoft Employee

2022-03-28T16:59:18.883+00:00

Hello @Wojtek Kaminski ,

Sure, let me double check with ADLS product team and will get back to you as soon as we hear back from the team.

Thank you

Wojtek Kaminski 1 Reputation point

2022-05-24T10:16:34.527+00:00

Hello @KranthiPakala-MSFT ,

do you have maybe some update for me?
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Azure Data Lake Storge gen2 with GRS - how to migrate back to primary region after failover?

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