Your company network has two physical locations configured in a geo-clustered
environment. You create a Blob storage account in Azure that contains all the data
associated with your company.
You need to ensure that the data remains available in the event of a site outage.
Which storage option should you enable?
A.
Locally redundant storage
B.
Geo-redundant storage
C.
Zone-redundant storage
D.
Read-only geo-redundant storage
The correct answer is B.
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D is correct.
https://msdn.microsoft.com/en-us/library/azure/dn727290.aspx
Read-access geo-redundant storage maximizes availability for your storage account, by providing read-only access to the data in the secondary location, in addition to the replication across two regions provided by GRS. In the event that data becomes unavailable in the primary region, your application can read data from the secondary region.
Geo-redundant storage (GRS). Geo-redundant storage is enabled for your storage account by default when you create it.
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B
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hmm. okay.
D..
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I cant see why you would not choose the default option of B??
Who cares about RO, this was not in the question.
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Why is answer D a better option. I go for GRS (answer B) bc I don’t want RO data when a site outage occurs! I want to be able to access (read/write) my data always.
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RA-GRS is the only option where data can be read from a secondary location when the primary fails.
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In the event of a site failure at the primary location the replicated data becomes readable. To get readable secondary data you need to move up to the much pricier Premium tier.
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D better – data is immediately available when failure occurs. B can take hours before made available.
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D.
“… data remains available ..”
Read-access geo-redundant storage (RA-GRS) “…maximizes availability…” for your storage account, by providing read-only access to the data in the secondary location, in addition to the replication across two regions provided by GRS. In the event that data becomes unavailable in the primary region, your application can read data from the secondary region.
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RA-GRS allows you to have higher read availability for your storage account by providing “read only” access to the data replicated to the secondary location. Once you enable this feature, the secondary location may be used to achieve higher availability in the event the data is not available in the primary region. This is an “opt-in” feature which requires the storage account be geo-replicated. Reference: Windows Azure Storage Redundancy Options and Read Access Geo Redundant Storage
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I agree. Found a good answer also here http://exam-test-ms-70-533.azurewebsites.net/
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It is most definitely D, read-only GRS.
From Microsoft Azure Essentials, first edition:
“The GRS copies in the paired region are not accessible to you, and GRS is best viewed as disaster recovery for Microsoft rather than for you.”
followed soon after by
“RA-GRS: This is GRS plus the ability to read the data in the secondary region, which makes it suitable for customer disaster recovery.”
In the event of a site outage, RA-GRS is the only one that is going to give you access to the data in the event of a (Microsoft) site outage.
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ZRS accounts cannot be converted later to LRS or GRS. Similarly, an existing LRS or GRS account cannot be converted to a ZRS account.
Geo-redundant storage (GRS) replicates your data to a secondary region that is hundreds of miles away from the primary region. If your storage account has GRS enabled, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region is not recoverable.
“”If an application wants to read from the secondary region, the user should enable RA-GRS””
what’s the point of RA-GS if you’re only using it for backup and not an application reading it?
ANSWER: Geo-redundant storage
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