Advanced High Availability (AHA) Transfer FAQsSummary<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } What is an Advanced High Availability (AHA) Transfer?ServiceNow deploys a mirrored architecture for all customer production instances, ensuring customer's instances are always up and available during a maintenance activity or service outage. An Advanced High Availability (AHA) transfer is the moving of the customer's production instance from the existing primary location to the other mirrored location. What is the impact on a customer when ServiceNow conducts an AHA & When do we conduct these AHAs?The impact of an AHA transfer is minimal (typically under 3 minutes) and occurs during off business hours in the location of the instance datacentre region.Nodes have to be repointed during that process nodes get restarted which may cause service interruption.Communications related to AHA:ServiceNow believes AHA Transfers are routine maintenance activities of short duration that have minimal or no impact on production instances conducted outside of business hours per local data center region.Customers that are not on an exception list will only get notified if the transfer is scheduled outside weekend hours based on the local data center.Purpose of AHA:We leverage AHA for customer production instances for the following purposes:Prior to executing maintenance, ServiceNow can proactively transfer operation of a customer instance from one data center to the other. The maintenance can then proceed without impacting service availability.In the event of the failure of one or more infrastructure components, service is restored by transferring the operation of the affected instance to the other data center.With this approach, the transfer between active and standby data centers is regularly executed as part of our standard operating procedures. This ensures that when it is needed to address a failure, the transfer will be successful and service disruption is minimized. Related Links<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Reference:Advanced High Availability Architecture:https://www.servicenow.com/content/dam/servicenow-assets/public/en-us/doc-type/resource-center/white-paper/wp-sn-advanced-high-availability-architecture.pdfKB0959443 Advanced high availability (AHA) overview