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Pegasus2 The Promise Pegasus icon will not show up in Finder even though Disk Utility says it is mounted.
Ken Chou posted this 05 May 2014

Symptoms: The Pegasus is showing no problems; WebPAM or Promise Utility gives all green checkmarks, Disk Utility will show "Promise RAID" volume as mounted and it will pass verify disk, but Finder still doesn't see the volume. You might be able to browse to your external volume directly at the Terminal command prompt, or with the Finder option "Go…", but the Pegasus RAID volume won't appear in Finder, on the Desktop, or within apps.

Cause: OS X uses the HFS+ filesystem, and to hide files from Finder it toggles the HFS+ hidden attribute on the files. Directories and volumes can also have the hidden flag set. Even while mounted correctly and having an clean filesystem, the folders or volumes will not show up in Finder. The hidden flag needs to be turned off within OS X. This problem has been reported with all types of storage, and is not unique to Promise hardware.

Solution:

How to Remove the Hidden Flag on the "Promise RAID" Volume

  1. Open Applications folder.
  2. Open Utilities Folder.
  3. Open Terminal.app.
  4. At the $ prompt, type: sudo chflags nohidden /Volumes/Promise\ RAID/ and press Enter. (If you have renamed the Promise RAID drive icon, then please type its name, instead of Promise RAID, after Volumes/. Tab Completion is a powerful feature, just type Pro and hit the Tab key to have it fill in the rest.)
  5. Enter your password at the password: prompt.
  6. At the next $ prompt, type: sudo killall Finder and press Enter.
  7. All your Finder windows will close and reopen, and the Promise RAID volume icon should be visible again.


Pegasus2 How do I turn off all hard disk drive power management features of Pegasus2?
Ken Chou posted this 22 January 2014

  1. Open Terminal, located in the Utilities folder (choose Go > Utilities in the Finder).
  2. In the Terminal window, type promiseutil. This will open a cliib> prompt.
  3. At the cliib> prompt, type ctrl -a mod -s "powersavinglevel=0"
  4. To verify the change, at the cliib> prompt type ctrl -v. You should see PowerSavingLevel: 0
To prevent the Mac from putting the Pegasus2 to sleep:
  1. Open System Preferences -> Energy Saver
  2. Uncheck the box beside "Put hard disks to sleep when possible"
NOTE If the above option is enabled, the hard drives in the Pegasus2 will spin down even if the PowerSavingLevel=0.  The Mac will control all disk spin down.

Pegasus2 Firmware v5.04.0000.17 and above offers the following default hard disk drive power management settings:
  • IdleTimeToParkHead:  1 minute.
  • IdleTimeToLowRotation:  5 minutes.
  • IdelTimeToSpinDown:  30 minutes,
  • PowerSavingLevel:  3.

PowerSavingLevel Options:
  • Level 0   Disabled.
  • Level 1   Park R/W heads.
  • Level 2   Park R/W heads. Lower rotation speed
  • Level 3   Park R/W heads. Lower rotation Speed. Spin-down HDD.

As highlighted above there are three levels of power management offered by Pegasus2.
Note: 0 simply disables all.

Lets say the user unchecks "Enable Idle HDD Spin Down" from the GUI, only the spin-down function will be disabled (level 3)


Other HDD power management features are still enabled.

To disable all HDD power management features, please follow the steps shown above. Once you invoke via Promise CLI the command "ctrl -a mod -s "powersavinglevel=0" this will disable all power management of the hard disk drives in Pegasus2. 

For the next service release we plan to disable level 1 and level 2 by default. This way the user only needs to change the setting via the Promise Utility GUI and simply uncheck "Enable Idle HDD Spin Down"

Important Information!

Please do not confuse "Power Saving Level" and "Power Management" features in Pegasus2

"Power Saving Level" (default is 3) is to control the hard disk drive rotation speed, spin down and head park.

"Power Management" (default is enable) is for Pegasus2 to support ACPI detection, wake-from-sleep and hot plugging of the Thunderbolt device.

Do not disable Power Management. Doing so will make the Pegasus2 hang when the Mac is in sleep or shut down and restarted and will require the Pegasus and the Mac to be power cycled to return to normal operation.

To view Pegasus2 Power Management state:
  • At the cliib> prompt, type: ctrl -v
  • You will see in the controller settings "PowerManagement: Enable"
  • If "PowerManagent: Disable", please follow the steps below to enable Power Management.
To enable Pegasus2 Power Management functions:
  • At the cliib> prompt, type: ctrl -a mod -s "powermanagement=enable"



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