Prepare for changes to Xsan before you update to macOS Sierra
Learn more about changes that happen when you upgrade your volumes to Xsan 5.
This article is intended for system administrators. If you believe that you are affected by this change, contact your institution's system administrator.
The first time you activate an earlier Xsan volume on macOS Sierra, the Xsan file system manager (fsm) upgrades your volume’s metadata to a newer format. Once this conversion begins, you won't be able to use this volume with Xsan MDCs running OS X 10.11 or earlier.
Older MDCs won't be able to control Xsan volumes that are created in Xsan 5. If you attempt to start a volume that has been upgraded to or created in Xsan 5 on an older MDC, the volume won't open. When this happens, the system will deliver an ICB alert.
Learn about other changes you might need to prepare your institution for before updating to iOS 10 or macOS Sierra.
