Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > Dell PowerScale: Non-Disruptive Upgrade Best Practices > HTTP behavior and configuration consideration
PowerScale OneFS has a built-in web service and we can easily access the files by using the HTTP protocol. At the time of writing, PowerScale only supports HTTP 1.1 which is a stateless protocol. See RFC 7230 for details of HTTP 1.1.
Since it is a stateless protocol, it is recommended using dynamic IP pool to make sure that all the IPs in the pool are accessible during the reboot of OneFS rolling upgrade process. However, if a file is in the transmission status, it will get disconnected by errors and you have to retry and re-establish the connection by manually refresh the page and reinitiate the file transfer. An alternative way is to use SmartConnect zone name to make sure that the client HTTP request can always find the right PowerScale nodes that are still alive. However, it has the same side effect. Since SSIP is a way of a delegation of DNS, it will not support HTTP requests by directly accessing the IP address. Best practices include the following:
Note: With all the recommendations above, the OneFS upgrade process still provides a disruptive upgrade. But it can dramatically minimize the impact.