Among one of the many changes between EVO versions 6 and 7 is the way EVO uses a secondary OS disk.
8 bay and 16 bay chassis have a spare OS disk stored at the rear of the chassis, with the primary disk marked "OS" (operating system) and the spare marked "X" (extra).
Version 6 EVO does not expect a disk to be connected, while version 7.0.1 does, so connecting it during the changeover from version 6 to 7 is the best way to ensure EVO boots correctly and places a copy of the operating system on the spare disk during upgrade.
Instances where the secondary OS disk are needed are exceptionally rare, and even if the secondary disk were unavailable or never connected, recovery should be possible using a new SNS-provided OS disk.
If your 8 bay or 16 bay system has a spare disk that needs to be connected for version 7 EVO:
- Connecting the secondary disk requires opening the chassis, for which you'll need a crosshead screwdriver and diagonal cutters.
- Run the first v7 upgrade and then shut down EVO
- Depending on hardware, this may happen automatically
Note: If EVO shuts itself down, the web interface may stop updating at "Upgrade status: Cleanup" -- if the drive lights are out on EVO, the process finished and the system is powered off
- If EVO completes the upgrade and presents an option to reboot instead of automatically shutting down, navigate to the System page and select Shutdown (or tap the power button on the chassis), and wait for the drive lights to go out
- Once EVO is powered down, pull the power cables and press the power button to discharge the system
- Remove the four screws in the lid at the top of the chassis, one screw on each side of the lid, and then loosen the thumbscrew at the rear of the lid to slide it back to then lift directly off the chassis
- Locate the OS disks at the rear of the chassis -- the powered disk is generally labeled "OS" (operating system) and the spare "X" (extra). Whether vertical or horizontal, the powered disk is closest to the power supply
- Ensure you're grounded before reaching inside
- You'll find there are two cables connected to the powered disk, and only one connected to the spare.
- Each disk needs both cables: a power connection (the white connectors) and a data connection (the black connectors)
- Carefully (!) cut the zip-tie on the SATA cables in order to connect the secondary disk exactly as the primary is connected. The other ends of the cables should already be correctly connected, though it's a good idea to trace them and confirm
- The following photos show correctly connected primary and secondary disks:
- Once both disks have both cables connected, return the EVO chassis lid and power cables
- Power on the system
- Continue upgrade process