About known issues with GitHub Enterprise Server upgrades
GitHub is aware of the following issues that could impact upgrades to new releases of GitHub Enterprise Server. For more information, see "Known issues" in the GitHub Enterprise Server release notes.
GitHub strongly recommends regular backups of your instance's configuration and data. Before you proceed with any upgrade, back up your instance, then validate the backup in a staging environment. For more information, see Configuring backups on your instance and Setting up a staging instance.
Required root disk size increased to 400GB
Note
The previous root disk size requirement of 400GB for versions 3.15.2 and later has been removed. This requirement was based on analysis of support bundles and support tickets. Some factors, such as logs, put excessive pressure on the root disk which caused appliance issues. After receiving feedback that it's challenging for many customers to procure new hardware, we rolled back the requirement in favor of a gradual approach. We still recommend customers, especially those using standalone or standalone high-availability topologies, upgrade the root disk to 400GB. When you are able to upgrade the root disk to 400GB, see the following instructions.
To customers using standalone or HA topologies, it is recommended that new installations of 3.15 or later, or upgrades to 3.15 to use root disk size of at least 400GB. GitHub strongly recommends following the guidance in Increasing storage capacity.