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Storage for web apps/cloud services in multiple datacenters

    Question

  • Hi all;

    We're setting up our system so we have stage & production in a U.S. datacenter and production is EU & S/Pore datacenters. In this case do we have to have a distinctly named storage account for each of these locations?

    And if we do have a distinct storage account for each datacenter, what is the downside to Locally Redundant Storage? If the datacenter goes down yes the storage is unavailable. But the web & cloud servers that hit it are down too so is there and negative?

    thanks - dave


    What we did for the last 6 months - Made the world's coolest reporting & docgen system even more amazing

    Wednesday, September 24, 2014 4:23 PM

Answers

  • Hi dave,

    >>In this case do we have to have a distinctly named storage account for each of these locations?

    You could use one storage account, but you may need spend on the data transfer across data center, see the price page: http://azure.microsoft.com/en-us/pricing/details/data-transfers/ . I suggest you can use different storage account for different locations.

    >>And if we do have a distinct storage account for each datacenter, what is the downside to Locally Redundant >>Storage? If the datacenter goes down yes the storage is unavailable. But the web & cloud servers that hit it are >>down too so is there and negative?

    For this issue, Locally redundant storage stores multiple copies of your data synchronously within a region for durability. But all copies is in one region. In other words, LRS could replicated the data copied in one data center.  If the datacenter or storage is unavailable, I think it may be downgrade the performance. If you are worry about Azure storage data, I suggest you could consider the geo replication. GRS's secondary locations is in other datacenters.( see this blog http://blogs.msdn.com/b/windowsazurestorage/archive/2013/12/04/introducing-read-access-geo-replicated-storage-ra-grs-for-windows-azure-storage.aspx#_Locally_Redundant_Storage ).

    Also, Azure guarantee storage read/write at least 99.9% of the time,we will successfully process requests to handle data from Locally Redundant Storage (LRS), Zone Redundant Storage (ZRS), and Geo Redundant Storage (GRS) Accounts and Read Access-Geo Redundant Storage (RA-GRS). Please see this (http://azure.microsoft.com/en-us/support/legal/sla/ ).

    Regards,

    Will


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    • Marked as answer by DavidThi808 Thursday, September 25, 2014 3:31 PM
    Thursday, September 25, 2014 6:15 AM
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