Restoring Backup from Block Blob

asked 2020-09-03T12:51:59.72+00:00
kevin eckart 26 Reputation points

Hello, we're using SQL 2017 Enterprise on a 3 nodes AG cluster and successfully backing up our databases to our Azure storage blob using a SAS token. We're uploading as a block blob as expected and can restore that DB to a single server in the AG successfully.

What we're having issues with is restoring the DB simultaneously across all three nodes in the event we need to restore the DB from a backup and have it in sync across 3 nodes. When we run the restore from URL command, first on Node 1, then a few seconds later on Node 2, then again on Node 3; Node 1 continues to restore as expected, but Node 2 and 3 hang and eventually comes back with the error that the file is in use. This is strange because I can do an AZCopy down from the blob to local storage simultaneously across all 3 nodes.

Is this expected behavior? Is there a better way to restore from block blob simultaneously?

Azure Blob Storage
Azure Blob Storage
An Azure service that stores unstructured data in the cloud as blobs.
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SQL Server
SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
8,470 questions
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Accepted answer
  1. answered 2020-09-03T19:29:48.73+00:00
    deherman-MSFT 23,516 Reputation points Microsoft Employee

    @kevin eckart
    Restore always takes a lease on the blob to avoid another operation changing the blob underneath while the restore is happening and to avoid restoring a blob from a backup that is not complete.

    Unfortunately this is by design and is not likely to be changed.

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