Salesforce.com is sending our communications to some of our mutual clients informing them that their production instance for their organizations Salesforce.com is being moved from one server cluster to another. The notifications state:
"The NAXX instance refresh has been scheduled for Month X, XXXX. Following the instance refresh, your org will be on the NAZZ instance.
In order to prepare for your organization’s continued growth, we occasionally need to perform an activity, called an instance refresh, where we upgrade the infrastructure supporting your instance in our data centers. This will enable us to continue to provide your organization with the same levels of performance you have come to expect from Salesforce.
Following this maintenance, your instance will move to another data center within the United States, and the name of your instance will change to NAZZ. If you follow our best practices linked below, the maintenance should be seamless.
NOTE: NAZZ will be on the same release and system maintenance schedule as your current instance.
When will this maintenance occur?
The instance refresh will take place on Weekday, Month, Day, Year during the 12 a.m.–4 a.m. PST standard system maintenance window. Your org will be available in read-only mode for the duration of the maintenance.
What action do I need to take?
We've created a one-minute readiness assessment to help you determine what steps you may need to take to prepare.
In summary, follow our best practices, outlined on the Salesforce Infrastructure Overview & Best Practices site, to ensure that you are prepared for this maintenance.
1. If you have any hard-coded references, you must update them to relative URLs or implement My Domain prior to the maintenance. Please note, not all hard-coded references are updated with My Domain. Review the Updating Hard-Coded References article for more information.
2. If your corporate network settings or email security filters restrict access to IP ranges or data centers, please ensure that you are including our current ranges. We made updates to our IP Ranges in January 2017.
3. Prepare to refresh integrations if you are experiencing integration issues following the maintenance.
4. Prepare to refresh your DNS cache if you continue to see a "Maintenance in Progress" alert following the maintenance window.
If you are not following our best practices prior to the scheduled maintenance window, your end users may no longer be able to access Salesforce after the maintenance is complete.
How can I get more information?
Review the Instance Refresh Maintenance article for more information and frequently asked questions. We also encourage you to collaborate with other Salesforce users within the Official: Salesforce Infrastructure group in the Success Community.
For additional questions, open a case with Support via the Help & Training portal."