This could also have impacted customers ability to access other Azure services that leverage AFD, in particular the Azure management portal and Azure Content Delivery Network (CDN). In addition to this, AFD platform also has in-built DDoS protection mechanisms on each node at both a system and an application layer. In Failover, choose a recovery point. Azure File Sync does not support storage account failover. The Standard Storage scale unit was fully available by 07:45 UTC, although the vast majority of clients would have seen availability restored by 06:05 UTC. This note provides the support matrix for SAP HANA on different OS releases. Restore a database to SQL Managed Instance, More info about Internet Explorer and Microsoft Edge, prerequisites for setting up failover groups for SQL Managed Instance, SQL Managed Instance management operations, Switch-AzSqlDatabaseInstanceFailoverGroup, Restore a database to SQL Managed Instance. Enter or select values for the following settings: Click Add to configure the peering with the virtual network you selected. More info about Internet Explorer and Microsoft Edge, Migrate Azure PowerShell from AzureRM to Az, Designing resilient applications for Azure, Use geo-redundancy to design highly available applications, Tutorial: Build a highly available application with Blob storage, Blob storage features available in Azure Data Lake Storage Gen2, Important implications of account failover, Check the Last Sync Time property for a storage account, Change how a storage account is replicated. Region: The Azure location that contains your virtual machines. Select the database you want to Gateway subnet. In this case, the original primary region prior to the failover becomes the primary region again, and is configured to be either locally redundant or zone-redundant, depending on whether the original primary configuration was GRS/RA-GRS or GZRS/RA-GZRS. Replication time depends on many factors, which include: More info about Internet Explorer and Microsoft Edge, Disaster recovery and storage account failover, Migrate Azure PowerShell from AzureRM to Az, Check the Last Sync Time property for a storage account, Use geo-redundancy to design highly available applications, Tutorial: Build a highly available application with Blob storage, Geo-redundant storage (GRS) or read-access geo-redundant storage (RA-GRS), Geo-zone-redundant storage (GZRS) or read-access geo-zone-redundant storage (RA-GZRS). The auto-failover groups feature allows you to manage the replication and failover of a group of databases on a server or all user databases in a managed instance to another Azure region. Portal; PowerShell; Test failover of your failover group using the Azure portal. However, if you need to fail over an account that contains unmanaged disks attached to Azure VMs, you will need to shut down the VM before initiating the failover. When you force a failover to the secondary region, clients can begin writing data to the secondary endpoint after the failover is complete. Geo-redundant storage (GRS) enables account level failover in case the primary region endpoint becomes unavailable: We've completed code updates to address the latent bug and help ensure the resource provider can process all results in similar scenarios. If your application needs access to SQL Server directly over the internet, use a public load balancer. We have created repair items for a resilient service architecture to improve failure recovery time. When to use manual failover. Improving our monitoring and alerting to detect these issues earlier and apply pre-emptive actions. Recommendations. To interact with Azure, the Azure Az PowerShell module is recommended. APPLIES TO: Azure Database for MySQL - Flexible Server Azure Database for MySQL Flexible Server allows configuring high availability with automatic failover. The following recommendations apply for most scenarios. SKU: Standard. Storage accounts that support premium block blobs do not currently support geo-redundancy. The architecture consists of the following components. Windows Server failover clustering with Azure Virtual Machines requires additional configuration steps. To initiate an account failover from PowerShell, call the following command: To use Azure CLI to initiate an account failover, call the following commands: When you initiate an account failover for your storage account, the DNS records for the secondary endpoint are updated so that the secondary endpoint becomes the primary endpoint. After the storage account is reconfigured for geo-redundancy, it's possible to initiate a failback from the new primary to the new secondary. Prerequisites. Consider configuring your accounts to be globally distributed enabling multi-region for your critical accounts would allow for a customer-initiated failover during regional service incidents like this one. You must have an existing on-premises infrastructure already configured with a suitable network appliance. Failovers from primary to secondary nodes in case of node degradation or fault detection, or during regular monthly software updates are an expected occurrence for all applications using SQL Managed Even in a rare and unfortunate event when the Azure region is permanently irrecoverable, there's no data loss if your multi-region Azure Cosmos DB account is configured with Strong consistency. The process sends initial data to the target location, and then replicates delta information for the VMs to the target. Select Review + create to review the settings for your secondary managed instance. As a result, other services dependent on these VMs were impacted by the same DNS resolution issues. The Azure Storage resource provider REST API enables you to manage the storage account and related resources. The AFD platform automatically balances traffic across our global network of edge sites. This reference architecture shows how to connect an on-premises network to an Azure virtual network (VNet) using ExpressRoute, with a site-to-site virtual private network (VPN) as a failover connection. On the VM Overview page, select Failover. VMware virtual machines running a Mobility service version older than 9.8. Microsoft also recommends that you design your application to prepare for the possibility of write failures. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. However, the Azure Storage resource provider does not fail over, so resource management operations must still take place in the primary region. If you cancel an in-progress job, failover stops, but the VM will not start to replicate. If you're using PowerShell to configure your managed instance, skip ahead to step 3. Applies to: Azure SQL Database Azure SQL Managed Instance As part of High Availability architecture, each single database, elastic pool database, and managed instance in the Premium and Business Critical service tier is automatically provisioned with a primary read-write replica and one or more secondary read-only replicas.Azure SQL Managed There is no customer action required for this failover. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. By 04:46 UTC, power was fully restored to all affected racks, and services continued their recovery. UPS systems have been inspected and all components are operating and functioning per design specifications. Failovers from primary to secondary nodes in case of node degradation or fault detection, or during regular monthly software updates are an expected occurrence for all applications using SQL Managed ACS is a globally distributed service and the metadata being retrieved was required for routing calls across different regions for the authentication process. It now allows you to use a single Regional pairing. Azure Files only allows SMB 2.1 connections within the same Azure region as the Azure file share; an SMB 2.1 client outside of the Azure region of the Azure file share, such as on-premises or in a different Azure region, will not be able to access the file share. For more information about installing Azure PowerShell, see Install the Azure Az PowerShell module. Azure Storage maintains multiple copies of your storage account to ensure durability and high availability. To safely offload the quantity of accounts we had to migrate, we systematically moved each database account to an alternative healthy cluster. Don't cancel a failover in progress: Before failover is started, replication s stopped for the VM. Live traffic takes priority over geo replication. Portal; PowerShell; Test failover of your failover group using the Azure portal. The subscription where your primary managed instance and resource group reside. Select Create to create your failover group. The Service-Managed failover option allows Azure Cosmos DB to fail over to the region with the highest failover priority with no user action should a region become unavailable. Storage accounts that have hierarchical namespace enabled (such as for Data Lake Storage Gen2) are not supported at this time. During this event, the whole region experienced a utility power outage, impacting all datacenters in the region. Navigate to your secondary managed instance within the Azure portal and select Instance Failover Groups under settings. In this article. At 06:00 UTC on 30 August 2022, a Canonical Ubuntu security update was published so Azure VMs running Ubuntu 18.04 (bionic) with unattended-upgrade enabled started to download and install the new packages, including systemd version 237-3ubuntu10.54. Failover continues even if shutdown fails. In this step, you will create the failover group and add both managed instances to it. However, the diagnostic change resulted in higher-than-expected time spent in the Kernel, which resulted in spikes of high CPU utilization across the cluster. Select Shut down machine before beginning failover if you want Site Recovery to try to shut down the source VMs before starting failover. The following recommendations apply for most scenarios. An Azure resource provider provides the ability for customers to create and maintain resources, in this case, for ACS. When a VM is running in Azure, any unmanaged disks attached to the VM are leased. Select Create to create your primary managed instance. At its peak, this impacted approximately 25% of the traffic, and on average, 10% of the traffic that traverses through the AFD service during the impact window. After failover Location Actions; Azure VM running Windows: On-premises machine before failover: To access the Azure VM over the internet, enable RDP, and make sure that TCP and UDP rules are added for Public, and that RDP is allowed for all profiles in Windows Firewall > Allowed Apps. Azure Files only allows SMB 2.1 connections within the same Azure region as the Azure file share; an SMB 2.1 client outside of the Azure region of the Azure file share, such as on-premises or in a different Azure region, will not be able to access the file share. Create the failover group using PowerShell. However, any data written to the primary that has not also been copied to the secondary is lost permanently. There are a number of jobs associated with failover. Follow the instructions in Configure a hybrid network architecture with Azure and On-premises VPN to establish your VPN virtual network gateway connection. How can customers make incidents like this less impactful? Applies to: Azure SQL Database Azure SQL Managed Instance As part of High Availability architecture, each single database, elastic pool database, and managed instance in the Premium and Business Critical service tier is automatically provisioned with a primary read-write replica and one or more secondary read-only replicas.Azure SQL Managed This portion of the tutorial uses the following PowerShell cmdlets: If you're using the Azure portal to create your secondary managed instance, you will need to create the virtual network before creating the instance to make sure that the subnets of the primary and secondary managed instance do not have overlapping IP address ranges. For resources that aren't fixed, open a support ticket to ask for an increase in the quotas. For an example, see Azure reference architecture: Run a web application in multiple regions . Some customers may have seen higher failures if their traffic was concentrated in the edges or regions with higher impact. Four Azure Storage scale units were impacted by the power loss (one Standard, two Premium, one Ultra Disk scale unit) resulting in the data hosted on these becoming inaccessible until power was restored and the scale units recovered to healthy states. Azure Front Door or Traffic Manager then shifts all traffic to the app in the secondary region. This article describes the concepts and process involved with an account failover and discusses how to prepare your storage account for recovery with the least amount of customer impact. Select Azure SQL in the left-hand menu of the Azure portal. After failover Location Actions; Azure VM running Windows: On-premises machine before failover: To access the Azure VM over the internet, enable RDP, and make sure that TCP and UDP rules are added for Public, and that RDP is allowed for all profiles in Windows Firewall > Allowed Apps. It is a declarative abstraction on top of the active geo-replication feature, designed to simplify deployment and management of geo-replicated databases at scale. In the event of an outage, write operations to the primary endpoint that have not yet been copied to the secondary endpoint will be lost. Site Recovery creates a new resource group in the target region, with an "asr" suffix. The following features and services are not supported for account failover: If your storage account is configured for read access to the secondary, then you can design your application to read from the secondary endpoint. Shared disks, is the only shared block storage in the cloud that supports both Windows and Linux-based clustered or high-availability applications. Once the failover is complete, clients can begin writing to the new primary endpoint. If you added a disk to a VM after you enabled replication, replication points shows disks available for recovery. The high availability solution is designed to ensure that committed data is never lost because of failures and that the database won't be a single point of failure in your software architecture. To see non-public LinkedIn profiles, sign in to LinkedIn. In the second datacenter, several Primary UPS systems (approximately 12% of the total UPS systems in the datacenter) failed to support the load during the transition to generator, due to UPS battery failures. We've added additional logging of backend database requests for the ACS resource provider, to ensure improved traceability in future. To avoid a major data loss, check the value of the Last Sync Time property before failing back. The ExpressRoute virtual network gateway enables the VNet to connect to the ExpressRoute circuit used for connectivity with your on-premises network. Type: Either public or internal. There is no customer action required for this failover. The two Premium Storage scale units were restored by 0510 UTC. Select Azure SQL in the left-hand menu of the Azure portal.If Azure SQL is not in the list, select All services, then type "Azure SQL" in the search box. Refer to these Azure resources for guidance in designing your application and planning for disaster recovery: Additionally, keep in mind these best practices for maintaining high availability for your Azure Storage data: Customers may subscribe to the Azure Service Health Dashboard to track the health and status of Azure Storage and other Azure services. After failover, you reprotect VMs in the target region so that they replicate back to the primary region. In this tutorial, you failed over from the primary region to the secondary, and started replicating VMs back to the primary region. For IaaS VMs, we are working to engage with Canonical to run dedicated tests on proposed packages before they are published for Azure users. We strongly recommend ensuring encryption of data in-transit is enabled. Select the primary managed instance from the drop-down. During both failover and rejoining of a previously failed region, read consistency guarantees continue to be honored by Azure Cosmos DB. The Change recovery point option will no longer be available. In Discover machines > Are your machines virtualized?, select Physical or other (AWS, GCP, Xen, etc.). Unmanaged disks are stored as page blobs in Azure Storage. On the VM Overview page, select Re-Protect. Nodes in a Windows cluster on virtual machines in Azure may be physically separated within the same Azure region, or they can be in different regions. Once the environment recovered, we began to gradually bring AFD instances back online to resume traffic management in a normal way. After failover, you reprotect the VM in the secondary region, so that it replicates back to the primary region. Check that you can access the primary region is available, and that you have permissions to create VMs in it. If you already have a VPN virtual network gateway in your Azure VNet, use the following PowerShell command to remove it: Follow the instructions in Configure a hybrid network architecture with Azure ExpressRoute to establish your ExpressRoute connection. Application tiers can be segmented using subnets in each VNet. Select Azure SQL in the left-hand menu of the Azure portal.If Azure SQL is not in the list, select All services, then type "Azure SQL" in the search box. Review the confirmation dialog. Type: Either public or internal. A device or service that provides external connectivity to the on-premises network. SKU: Standard. Once the failover has been performed, the old primary is abandoned and a new secondary Event Hubs needs to be created in a different target region. For additional options, see Change how a storage account is replicated. Azure Site Recovery replicates workloads running on physical and virtual machines from a primary site (either on-premises or in Azure) to a secondary location (in Azure). (Estimated completion October 2022). For protection against regional outages, configure your account for geo-redundant storage, with or without the option of read access from the secondary region: Geo-redundant storage (GRS) or geo-zone-redundant storage (GZRS) copies your data asynchronously in two geographic regions that are at least hundreds of miles apart. The failover process updates the DNS entry provided by Azure Storage so that the secondary endpoint becomes the new primary endpoint for your storage account, as shown in the following image: Write access is restored for geo-redundant accounts once the DNS entry has been updated and requests are being directed to the new primary endpoint. This issue was confined to Ubuntu version 18.04, but impacted all Azure regions including public and sovereign clouds. After the failover, sign into the VM to validate it. Please try refreshing the page. Each Azure region is paired with another region within the same geography. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Next steps: We will continue to investigate to establish the full root cause and prevent future occurrences. If you want to fail over multiple machines. To verify the subnet range of your primary virtual network, follow these steps: In the Azure portal, navigate to your resource group and select the virtual network for your primary instance.
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