When performing a site-by-site upgrade, am I limited by the number of versions I can upgrade across?
Yes, you can only use the site-by-site method to upgrade from one minor version to the next. You cannot perform a site-by-site upgrade for skip-version upgrades.
That is, you can perform a site-by-site upgrade from 6.3.x to 6.4.x, or from 6.4.x to 6.5.x, but you cannot use this method to upgrade directly from 6.3.x to 6.5.x.
To upgrade directly from 6.3 to 6.5, you must take down all nodes across all sites during the upgrade process.
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