Using the Pegasus1 or Pegasus2 with a modern macOS

To use a Pegasus1 or Pegasus2 on a modern MAC (including the M1 MACs), a driver for that macOS version must be used. The Pegasus32 drivers are backwards compatible and should be used. For M1 MACs, the user space driver is recommended.

For Intel MACs, macOS has a Pegasus driver installed and this should be used.

Managing a Pegasus1 or Pegasus2 with a modern macOS

To manage a Pegasus1 or Pegasus 2 on a modern MAC, the Promise utility from the Pegasus32 downloads should be used. The Promise utility in the Pegasus1 or Pegasus2 downloads page was compiled for a macOS 8 to 10 years old and won't work correctly in Big Sur and above due to changes in macOS.

But the latest Promise Utility won't update the firmware in a Pegasus1 or Pegasus2, so a slightly older version needs to be used. Promise Utility v4.06.0000.01 will update the firmware in the Pegasus1 and Pegasus2.

Updating formware in a Pegasus1 or Pegasus2

If older Pegasus1 or Pegasus2 firmware is loaded, there may be issues like random disconnects and failure of the volume to mount after a reboot. The latest Pegasus1 or Pegasus2 firmware should be used.

For the Pegasus1 the latest firmware from the Pegasus1 downloads page is v5.04.0000.61.

For the Pegasus2 the latest firmware from the Pegasus2 downloads page is v5.04.0000.64.

For unknown reasons the firmware update won't work from the Promise Utility, the CLI should be used. If the Promise Utility is used it will fail saying the controller has failed, which is incorrect.

So the CLI must be used.

This is the process for the Pegasus1, start the CLI by opening a terminal and typing 'promiseutil', then at the cliib prompt start the process by typing

ptiflash -f

Then drag and drop the firmware file from finder to the terminal and it will paste the file with full path into the terminal, and press enter.

promise@promises-Mac-mini ~ % promiseutil                     
Promise Utility
Version: 4.06.0000.01 Build Date: Aug 4, 2021
List available RAID HBAs and Subsystems
Type  #    Model         Alias                         WWN                 Seq
hba   1  * Pegasus R4                                  2000-0001-5530-6d27  1
Totally 1 HBA(s) and 0 Subsystem(s)
The row with '*' sign refers the current working HBA/Subsystem path
To change the current HBA/Subsystem path, you may use the following command:
  spath -a chgpath -t hba|subsys -p <path #>.
Type help or ? to display all the available commands
cliib> ptiflash -f /Users/promise/Desktop/Pegasus\ 1/R_SI_504000061.img
Start transferring image, please wait ...
Flash image has been successfully transferred.
Start flashing image, please wait ...
  ... 100 percent completed...
Flash Completed.
cliib> shutdown -a shutdown

The firmware update will not start immediately, be patient. After the update is completed the Pegasus must be power-cycled to load the updated firmware. To do this shutdown the Pegasus with the shutdown command (as above). To restart the Pegasus1 or Pegasus2, remove the power cord and plug it back in.

After the reboot the firmware version should be verified. To check the controller firmware version you can use with the Promise Utility GUI or the CLI with the following command.

ctrl -v

The process is identical for the Pegasus2, except the Pegasus2 firmware file should be used.