Posts in Disaster Recovery

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Availability Group Endpoint URL Firewall Gotcha

A few days ago I was working on changing the Endpoint URL and Port for a 2016 SQL Server Availability Group to use a private network interface. We wanted this so we could have the Synchronizing (or Mirroring) traffic have its own dedicated network, which would keep it away from the network traffic of client connections to the database server. This would help increase the throughput of data to and from the databases in the Availability Databases list.

Our setup is a straight forward Windows Cluster with two Nodes. We have two stand alone SQL Server Instances running on these Nodes. Each Instance has an Availability Group defined with one Node the Primary Replica and the other Node the Secondary Replica. We run the Replicas in Synchronous Commit Availability Mode with Automatic Failover. All connections are allowed to the Primary Role and the Readable Secondary is set to no.

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AWS really does make the Pain of Purchasing Servers go away

I have thought a lot about how I used to provision traditional IT resources, and how differently I would provision Amazon Web Services resources in the cloud today. Maybe you can benefit from my perspective, based on experience, that keeps it plain and simple.

In the past, I had to think about how much hardware and software I could buy with a given budget. I would over-engineer the architecture, since I would have to live with it for several years. It was better to be safe with more than I could use, than be sorry trying to explain why the money already spent wasn’t enough. Building a whole test system up front to prove it would work would also increase costs, Read More

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How to migrate a Microsoft SQL database back to an older version of SQL

There are situations where you might need to migrate newer-version SQL Server databases to older versions of the MSSQL engine, such as in various QA or testing scenarios, or after an upgrade that for any number of reasons calls for a rollback but needs to keep existing data. Unfortunately, backup/restore does not work when going from a newer to an older version of Microsoft SQL Server– it is not possible to restore a SQL 2012 database backup into a SQL 2005 server, for example. So in order to accomplish this, we have to take a different approach. Keep reading…

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