Category Archives: Uncategorized

In Which the Promise Utility GUI is Not Showing Stats

You open the Promise Utility to get some stats from the Subsystem (Promise Utility > Subsystem Information), but the Promise Utility displays nothing.

You try the command line. Nada. Zip.

Fear not. Try this (your mileage may vary, entirely at your own risk, if you’re not utterly certain what you’re doing, do not do any of this):

1. Umount your Promise volume(s) first.

diskutil unmount /Volumes/NameOfVolume1

2. Unload and delete the kernel extension:

sudo kextunload -b com.promise.driver.stex
sudo rm -rf /Library/Extensions/PromiseSTEX.kext

3. Delete the Pegasus Utility:

sudo rm -rf /Applications/Promise\

4. Delete the Promise Utility plist:

sudo rm -rf /Users/<username>/Library/Preferences/com.promise.PromiseUtility.plist

5. Delete the LaunchDaemons plist files:

sudo rm -rf /Library/LaunchDaemons/com.promise.emaild.plist
sudo rm -rf /Library/LaunchDaemons/com.promise.bgasched.plist
sudo rm -rf /Library/LaunchDaemons/com.promise.BGPMain_R.plist
sudo rm -rf /Library/LaunchDaemons/com.promise.diskmonitor.plist

6. Delete promiseutil (The Promise Utility installer pkg will re-install this):

sudo rm -rf /usr/local/bin/promiseutil

7. Restart the Mac.

8. Install the Pegasus 6.2.9 driver and the Promise Utility.

9. See if you now have stats for the Promise Pegasus via GUI and CLI.

Scanning more than one Promise device with promiseutil

So, comes the day when you have more than a single Promise Pegasus attached to a Mac and you’d like to leverage some of your utilities to check the second device.

“No problem,” you think, “I’ll just count the number of devices, then check each one in sequence.”


promiseutil is broken in one, very important way.

From inside promiseutil, the command to switch to the second unit in the chain would be something like:

spath -a chgpath -t hba -p 2

And that command works just fine. But as we’ve seen from previous work, executing promiseutil from inside a bash script requires the use of the screen command.

Executing this command from inside promiseutil run under screen does not work correctly. promiseutil appears to ignore the command and remains on the default device.

The official response from Promise is as follows:

This has been made/designed in a way to work as it is described in the KB article (and it is not a bug,but that’s how it has been designed to work) that was given on my earlier reply and it can’t used in the way that you have given and I am sorry that there are no work around available.

If you know someone at Promise and have any influence, it would be a significant improvement to have this bug removed from the next release of the promiseutil.

Heck, if you’re feeling bored, file a bug report with them here.