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If I have an RSV vault in my DR/Secondary region and I'm running ASR on some VMs (app/sql VM) however, I have no Backup Items, nor do I plan to have any). Does the storage replication type matter if it is locally redundant vs geo-redundant IF I desire the following feature: I want to be able to fail back to primary region, after running transactions in the DR region during the disaster, and not lose any transactions (including those during DR) when I go back to primary region? @https://learn.microsoft.com/en-us/users/na/?userid=a99787f3-7898-4128-9ac8-a27d38e96d95 @Sadiqh Ahmed Please answer question and provide context - Thanks!
An Azure native disaster recovery service. Previously known as Microsoft Azure Hyper-V Recovery Manager.
@Sadiqh Ahmed Thanks for your reply, but maybe I'm not being clear (I do understand how LRS and GRS works in terms of replication). I certainly want to do cross region DR to the paired region. In this case East US 2 is primary and Central US is DR/Secondary region. Here is my use case:
Question: So the question is, why would the RSV in the DR Region have to be GRS? Context: this makes me think that anything that is replication to DR Site, will in turn also have the information copied back to the paired region in East US 2?? Which would only drive up cost and I feel has no need. Therefore it would be logical to set it to LRS because I have no need to copy back to East US 2. NOW, if I failover to DR (in Central US) and start running real business transactions, then if East US 2 ever comes back online, then I would want to return to East US 2. I feel like in that case, I would setup a new RSV in East US 2 and replicate the VMs that are in DR Site (because the new business transactions are there) - back to primary region, and then fail back to East US 2 - and resume BAU.
That is, if my thinking on how this works is as I described. If it is, then there is no need to have GRS setup on the RSV in DR region because it seems it would only double my costs, for no benefit. Hope this makes sense - Thanks (please clear my thinking!! :-)
@Rob McNees You are correct! You don't need to use GRS, the cost concern is valid. However, the choice between GRS and LRS for the Recovery Services Vault (RSV) is more about data durability in the secondary region rather than controlling the direction of replication.
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Hi @Rob McNees , Storage replication setting on RSV is only applicable for the backups that it stores and not for ASR instances tied to it. Hope this answers your question.
Hello @Rob McNees Thank you for reaching out to us on Microsoft Q&A platform. Happy to answer any questions you may have!
I see that you have a question about storage redundancy and how it works (LRS vs GRS) with Azure Site Recovery.
Storage redundancy options will not affect site recovery replication to Azure. However, it does affect in the event of disaster.
LRS replicates your data within the region in which you created your storage account unlike Geo-Redundant Storage (GRS), which replicates your data to a secondary region. With LRS, three copies of your data reside in separate fault domains and upgrade domains within the region. From a cost perspective, LRS works out to be much more economical as compared to GRS, and also offers higher throughput.
In general, we recommend that you use a geo-redundant storage account (GRS) account as this ensures that your data is durable even in the case of a complete regional outage or a disaster in which the primary region is not recoverable. But if your application can be easily recovered during an Azure region outage or your data governance requirements restrict replication of data across regions, replication to LRS will work out to be better.
Hope this answers your question. Please write back to us if you have any further questions!
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I'm sorry @Sadiqh Ahmed I did not mean to put Low. Your service and response is very High and always is. Please accept my apology, I did not mean to press Low. I must have "fat-fingered" it.