About the Promise Pegasus R4i MPX RAID storage module for Mac Pro (2019)

Learn how to install and use the Pegasus R4i with your Mac Pro (2019).

The Pegasus R4i, built for Mac Pro (2019), is a plug-and-play RAID MPX module with four 8TB swappable 7200rpm SATA HDDs, providing 32TB of raw storage. The Pegasus R4i comes preformatted in HW RAID 5. macOS Catalina includes built-in support, too, so you can get started using the volume immediately after installation.

Install the Pegasus R4i module in slots 1-2 of Mac Pro

For best performance, Apple recommends that you install the Pegasus R4i module in slots 1-2 of your Mac Pro. You might have to move an existing MPX module from slots 1-2 to slots 3-4 in your Mac Pro. You can also find installation instructions in the quick start guide in the Pegasus R4i package and on the Promise website.

Restart Mac Pro and install the Pegasus Utility Software

Once you've installed the module and restarted your Mac Pro, the Pegasus R4i appears as a volume. When Mac Pro first recognizes the module, you’ll hear a series of tones from the module itself. And you’ll hear another set of tones when you log in and the volume mounts successfully. To manage the Pegasus R4i, install the Pegasus Utility software. The installer is located on the Pegasus volume. For help using the Pegasus Utility to manage your RAID volume, visit the Promise website.

Turn off Power Nap

As a final step, turn off Power Nap on your Mac Pro: in the Finder, choose System Preferences > Energy Saver, then deselect Enable Power Nap.

Before shipping, always remove the Pegasus R4i Storage Module from your Mac Pro to avoid damaging your computer.

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