This is part two of a three-part series explores disaster-recovery options, from models to environments to public cloud offerings. Are you ready?
This three-part series explores disaster-recovery options, from models to environments to public cloud offerings. Are you ready? If you haven’t read it, check out Part One.
Traditional, on-premises DR involves significant costs and administrative work, including:
By moving your DR to the cloud, you can offload these responsibilities to your service provider. Businesses use the public cloud to meet their DR requirements in the following ways:
Hosting your DR system on a major public cloud addresses many of the preceding requirements through features already provided by Amazon Web Services® (AWS), Microsoft® Azure®, and Google Cloud Platform™ (GCP). These services offer the following features:
AWS, Azure, and GCP offer some of the largest and most advanced networks in the world. They use advanced software-defined networking and edge-caching services to deliver consistent and scalable performance.
Public cloud providers deliver robust redundancy through multiple global points of presence. With many cloud-native services, your data replicates automatically across storage devices in multiple locations and regions.
Public cloud is designed to scale, even when your systems experience a huge traffic spike. Managed services like Amazon Simple Storage Service (S3), Amazon Elastic Compute Cloud (EC2), VM autoscaling, and Database-as-a-Service (DBaaS) enable automatic scaling so your application can scale up and down as needed.
The major cloud solution provider (CSP) security models are based on many years of experience in keeping customers safe on applications like Amazon®, Windows®, Microsoft Office®, Hotmail, Gmail®, and G Suite. CSPs specialize in keeping data safe, thanks to the best data centers and most skilled IT security staff. Their data centers have multi-layered security, with exceptional defenses, including high fences, concrete barriers, barbed wire, security systems, and cameras.
CSPs are subject to regular independent audits to verify that cloud platforms align with compliance, security, and privacy regulations. Also, they follow best practices and comply with numerous certifications, such as ISO 27001, SOC 2/3, and PCI DSS 3.0.
Azure provides comprehensive guidance and services to customers, along with reference architectures, which map to the DR models described previously. Offering a wide range of products and a mature native Disaster-Recovery-as-a-Service (DRaaS) solution, called Azure Site Recovery, which is widely used, Azure was recognized as a leader in DRaaS services by Gartner in the 2019 Magic Quadrant for DRaaS.
Following are features and services available from Azure that support DR solutions:
The Azure native backup solution is simple and easy to use through the Azure portal. Backup services include the following:
Azure site recovery capabilities to support DR include the following:
Azure geo and zone redundant storage capabilities to support DR include the following:
Locally redundant storage (LRS): The lowest cost option. Data is replicated three times within a single physical location in the primary region. It provides 99.999999999% durability over a year. This option is suitable if you want to restrict data to one region or country due to governance constraints.
Zone redundant storage (ZRS): ZRS replicates data synchronously across three availability zones within a region. Each zone is in a separate physical location with dedicated networking, power, and cooling. It provides 99.9999999999% durability over a year. This option is suitable if you want to restrict data to one region or country due to governance constraints.
Geo-redundant storage (GRS): GRS replicates data synchronously three times within one physical location in the primary region using LRS. Data is also replicated asynchronously to one physical location in a secondary region that is at least 300 miles away from the primary region. It delivers 99.9999999999% durability over a year. This option protects your data against region failure.
Geo-zone-redundant storage (GZRS): GZRS combines high availability through redundancy across multiple availability zones with geo-replication, protecting against both zone and regional failures. This option provides 99.99999999999999% durability over one year.
Read-access geo-redundant storage (RA-GZRS): RA-GZRS provides read access to the secondary region.
Azure archive storage capabilities to support DR include the following:
Azure Traffic Manager capabilities to support DR include the following:
Azure SQL Database capabilities to support DR include the following:
Azure supports DR by providing VM and native database replication capabilities. All major CSPs allow the use of native database replication features to replicate data running in the infrastructure-as-a-service (IaaS) model, from primary to secondary zones and regions. Common examples include Data Guard replication for Oracle® databases or always-on availability groups for SQL Server.
Check out Part Three of this series on disaster preparation to learn more about AWS and GCP DR offerings.
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