PROMISE Utility
Contents
PROMISE Utility#
Author: Fu Yin
Update: Dec 18, 2022
Reading: 60 min
Introduction#
My disk’s version is
Pegasus32-R4
, the product’s website is https://www.promise.com/Products/Pegasus/Pegasus32Resources (drivers, utilities, and manuals) can be downloaded via https://www.promise.com/Support/DownloadCenter/Pegasus/Pegasus32/R4#Drivers

Fig. 39 My Disk#
Dirvers and Utilities#
Please consider to install the following drivers and utilities:
Pegasus32 /3 Series DEXT Driver for Apple-Silicon Macs
: the driver in M1 chip. (I install it in M1 but not loaded…due to some problems)

Fig. 40 Driver#
PROMISE Utility Pro for Mac
: the utility for Intel Macbook.Pegasus32 Series Utility for Mac
: the utility for Apple-M1 Mac, and will generate thepromiseutil
command-line tool after installation.

Fig. 41 Utilities#
A common problem is: eject one of the drives in Pegasus R4 system when it is working, when plug it back in, it came up with a red light instead of blue, which will show as “Dead” in the Promise utility. How to recover it?
Open the Terminal and type promiseutil
(based on Pegasus32 Series Utility for Mac
), and hit Return to log into the CLI
Force the drives back online with the following commands:
# open `cliib` mode
promiseutil
# input in `cliib` mode
phydrv -a online -p1
phydrv -a online -p2
phydrv -a online -p3
phydrv -a online -p4
After forcing the PDs (Physical Disks) back online, the LEDs will turn back to blue and your volume should be accessible after forcing the (3) PDs back online.
Reference with same problem: