Microsoft has been working to ensure that the services provided by the available all the time, but sometimes, a variety of uncontrollable factors can result in one or more regional unplanned outages, affect us, in order to help you deal with these events, we provide the following for Azure storage service overview guidance,

to be interrupted in storage space do
If one or more areas of one or more storage service is temporarily unavailable, can consider the two options, if you need immediate access to the data, please consider "option 2",

option 1: waiting for recovery
In this case, no need to take any action, we are trying to restore the usability of the Azure services, in the Azure services running status dashboard monitoring service status,

option 2: from the secondary database replication data
If choose for storage account read access different redundant storage (RA - GRS) (recommended), you can access data from the secondary area, can use AzCopy, Azure PowerShell and Azure data such as mobile library tool copies data from the secondary area to other storage account in the territory is not affected, then application to the storage account, ensure that can read and write,

what happens for storage space failover

If you choose different redundant storage (GRS) or read access regional redundant storage (RA - GRS) (recommended), Azure storage data will be persisted in the two areas (mainly zone and the secondary zone), in these two areas, Azure storage always maintain multiple copies of your data,

When disaster influence the main area of the region, we will first try to restore service in the region, in a few cases, we may not be able to restore the main area, depending on the nature of the disaster and its influence, and in that case, we will conduct a long-distance failover, cross-regional data replication is an asynchronous process may be delayed, therefore, may be lost has not been copied to the secondary area change, if you want to learn more about replicated state, can inquire store account "of" the last synchronization time,

Experience some of the views of relevant storage space beyond the failover:
Only through Azure storage team - trigger storage space beyond the failover operation without customers,
For Blob, list, queue, and file the existing storage service endpoint after failover remain unchanged; You need to update the DNS entries to switch from the main area to the secondary area,
In long distance before and during failover, due to the impact of the disaster, not to write access storage account, but if your account has been configured for RA - GRS, still can be read from the secondary regions,
After complete long-distance failover and spread the DNS changes, to store account to read and write access to recover; The location of the point once was a secondary end point,
Please note that if the account configuration for storage GRS or RA - GRS, the user will have write access,
If you want to know more detailed information, can inquire store account "different failover time last time,"
After failover, storage account can normal use, but in a state of "has been demoted", because in fact it is managed in a separate area, impossible to long-distance copy, in order to alleviate this risk, we need to restore the original main area, and through the different fault reply to restore the original state, if the original main area of unrecoverable, we will assign other secondary area, the Azure storage beyond the duplicate infrastructure more detailed information, please refer to the storage team blog about redundancy options and RA - GRS,

the best practices of data protection

Can backup data is stored on a regular basis, by using the method of some recommended

Disk - use Azure VM backups service Azure VM used in the virtual machine disk,
Piece of Blob - use AzCopy, Azure PowerShell or Azure data snapshots of the mobile library to create each piece of Blob, or copies Blob to other storage in other areas of the account,
Table - use AzCopy will table data in other areas of the export to other storage account,
File - use AzCopy or Azure PowerShell copying the files to other storage in other areas of the account,

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