Pegasus2 Articles

How do I access the Command Line Interface (CLI) in Windows?

2016-11-29T19:50:00.8870000

Sometimes in the manual or in other Knowledge Base articles, you will be asked to access the Command Line Interface, also known as the CLI.

In Windows, this is accessed by the Command Prompt (cmd).

It is an executable file called cliib in the apache directory of your Pegasus Utility. Once you change to that directory, run the command cliib.

1. The cliib executable file is located in C:\Program Files (x86)\Promise\Pegasus Utility\apache

2. Open Command Prompt and navigate to:
C:\Program Files (x86)\Promise\Pegasus Utility\apache>cliib.exe
3. Hit Enter/Return on your keyboard to enter the cliib.

Are high NonRWRequest on my Pegasus2 hard disk drives indicating an impending drive failure?

2014-12-12T13:20:15.0000000

No. Seeing high NonRWRequest does not indicate a problem with the drives or unit. The high count is incorrect and erroneous. It can safely be ignored.

Firmware 5.04.0000.36 and older exhibit the incorrect high NonRWRequest count.

An upcoming firmware release will correctly monitor NonRWRequest and give accurate results.

PhyDrvId: 3

DataTransferred: 61.06GB

ReadDataTransferred: 18.96GB WriteDataTransferred: 42.10GB

Errors: 0 NonRWErrors: 0

ReadErrors: 0 WriteErrors: 0

IORequest: 1,084,468 NonRWRequest: 636,662

ReadIORequest: 35,810 WriteIORequest: 411,996

StatsStartTime: Dec 11, 2014 07:44:58

StatsCollectionTime: Dec 11, 2014 15:07:02

The Promise Pegasus icon will not show up in Finder even though Disk Utility says it is mounted.

2014-05-05T14:09:46.0000000

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

Open Applications folder.
Open Utilities Folder.
Open Terminal.app.
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.)
Enter your password at the password: prompt.
At the next $ prompt, type: sudo killall Finder and press Enter.
All your Finder windows will close and reopen, and the Promise RAID volume icon should be visible again.

How do I turn off all hard disk drive power management features of Pegasus2?

2014-01-22T10:32:31.0000000

Open Terminal, located in the Utilities folder (choose Go > Utilities in the Finder).
In the Terminal window, type promiseutil. This will open a cliib> prompt.
At the cliib> prompt, type ctrl -a mod -s "powersavinglevel=0"
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:

Open System Preferences -> Energy Saver
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"

What is the acoustic noise level of Pegasus2?

2014-01-16T08:57:25.0000000

The Pegasus2 is very quiet.

Pegasus2 R4, Pegasus2 R6 and Pegasus2 R8 share the same noise level characteristics.

Test Conditions:

Bandwidth: 100Hz~20KHz
Environmental correction K2A=-0.1dB
Measurement duration: 30 seconds
The acoustic noise test condition refers to ISO 7779(SPL)

Results:

Idle mode: Less than 27 dB
Operation mode: Less than 32 dB

Will Apple's Thunderbolt-to-Firewire adapter enable Thunderbolt devices to connect to a Firewire port?

2013-12-31T12:43:45.0000000

Apple’s Thunderbolt-to-FireWire adapter is designed to attach legacy FireWire devices to a new Thunderbolt-equipped Mac without a FireWire port. This adapter requires a Thunderbolt-equipped Mac to function.

The adapter does not work in the reverse direction. It will not enable FireWire-only Mac systems to connect to any external Thunderbolt device.

If you have a Mac with only a FireWire or DisplayPort, it cannot be used with any Thunderbolt device; including Pegasus R Series, Pegasus2 R Series, Pegasus J Series, or SanLink family products.

How to bench mark Pegasus2 R8

2013-12-26T13:21:52.0000000

There are several bench tools out there among them are Black Magic Disk Speed Test and AJA System Tests.

These tools are ok to gauge basic throughput. Before you begin your benchmark testing we recommend to enable the aggressive pre-fetching AKA “controller forced read ahead” on your Pegasus2.

Promise plans to enable controller forced read ahead by default in the upcoming service release.

NOTE: Controller forced read ahead is most beneficial if you are working with Audio and Video files where the IO access is large block sequential IO.
Small block random IO will not benefit from this setting.

How to enable controller forced read using Promise CLI:

1. Login using your Administrator and from a terminal in your Mac host type “promiseutil”

2. From our CLI type: ctrl -a mod -i 1 -s "forcedreadahead=enable"

3. Confirm the setting is now enabled issuing the following command: ctrl -v

CtrlId: 1
Alias:
OperationalStatus: OK PowerOnTime:2 hours 1 minute
LUNAffinity: N/A                      LunmappingMethod:WWN Based
CacheUsagePercentage: 35%             DirtyCachePercentage:34%

Vendor: PROMISE                       Model:Pegasus2 R8
PartNo: F29DS8722000000               SerialNo:M92H13A52100830
HWRev: B3                             WWN:2000-0001-5557-5d82
CmdProtocol: SCSI-3
MemType: DDR2 SDRAM                   MemSize:512MB
FlashType: Flash Memory               FlashSize:8MB
NVRAMType: FRAM                        NVRAMSize:128KB
BootLoaderVersion: 5.04.0000.17       BootLoaderBuildDate: Oct 25, 2013
FirmwareVersion: 5.04.0000.17         FirmwareBuildDate: Oct25, 2013
SoftwareVersion: 5.04.0000.17         SoftwareBuildDate: Oct25, 2013
BIOSVersion: 5.04.0000.17             BIOSBuildDate:Oct 25, 2013
SingleImageVersion: 5.04.0000.17      SingleImageBuildDate: Oct 25, 2013
CtrlCPLDVersion: 6.03

DiskArrayPresent: 1                   OverallRAIDStatus:OK
LogDrvPresent: 1                      LogDrvOnline:1
LogDrvOffline: 0                      LogDrvCritical:0
PhyDrvPresent: 8                      PhyDrvOnline:8
PhyDrvOffline: 0                      PhyDrvPFA:0
GlobalSparePresent: 0                 DedicatedSparePresent:0
RevertibleGlobalSparePresent: 0       RevertibleDedicatedSparePresent: 0
RevertibleGlobalSpareUsed: 0          RevertibleDedicatedSpareUsed:0

WriteThroughMode: No                  MaxSectorSize:4KB
PreferredCacheLineSize: 64 KB         CacheLineSize: 64 KB
Coercion: Enabled                     CoercionMethod:GBTruncate
SMART: Enabled                        SMARTPollingInterval:10 minutes
MigrationStorage: DDF                 CacheFlushInterval:3 second(s)
PollInterval: 15 second(s)            AdaptiveWBCache:Disabled
ForcedReadAhead: Enable

PowerSavingLevel: 3                   SpindownType:All drives
IdleTimeToParkRwHeads: 1 minute       IdleTimeToLowerRotationSpeed: 5minutes
IdleTimeToSpinDown: 30 minutes

SGPIOBackPlane: Default/Generic (0) SASReadyLED: Off
SpinUpDelay: 0 millisecond            PowerManagement:Enable

SecurityAdminPassword: N/A

PciFuncAddr: N/A                      PciLinkSpeed:N/A
PciLinkWidth: N/A

After this you can run your typical benchmark tool such as Black Magic Disk Speed Test or AJA System Test.

Note: Although these tools are common and readily available to the public, Promise does not use these tools to gauge performance on Pegasus 2.
These bench tools do not exercise Pegasus 2 full performance bandwidth. Real-world video and audio applications set the “queue depth” to something more realistic like 7 or 8 thus why you don't see the “real” throughput of Pegasus2.

What is the real throughput of Pegasus2 R8?

Using Promise home grown bench test tools:

For RAID 0 ForcedReadAhead enabled:
-1340MB/s sequential writes
-1350MB/s sequential reads

For RAID 5 ForcedReadAhead enabled:
-1020MB/s sequential writes
-1030MB/s sequential reads

What parameters does Promise use in their testing to gauge the above performance?

100% sequential write, IO request size 1MB, Queue depth 8, file size 100GB
100% sequential read, IO request size 1MB, Queue depth 8, file size 100GB

Using Black Magic Disk Speed Test:

RAID 0 configuration using - ForcedReadAhead enabled:

Using RAID 5 out of the box configuration using - ForcedReadAhead enabled

Note: Pegasus2 ships from the factory pre-configured with one logical drive in a RAID 5 configuration. Synchronization is not yet complete. The synchronization process is running in the background. Device performance will not be optimal until background synchronization is completed. The process will take several hours. The amount of time required depends on the total capacity.

Pegasus2 series power consumption and thermal output

2013-12-18T10:00:32.0000000

Pegasus2 Power Consumption and Thermal Output values below are for Pegasus2 units with included factory installed hard disk drives.

Pegasus2 R8
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.664	71.5	244.0
Idle	230v/50Hz	0.385	69.8	238.2
Operation	110v/60Hz	0.745	80.3	274.1
Operation	230v/50Hz	0.426	78.8	269.0

Pegasus2 R6
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.519	55.4	189.1
Idle	230v/50Hz	0.321	54.6	186.3
Operation	110v/60Hz	0.608	65.5	224.7
Operation	230v/50Hz	0.356	62.2	212.3

Pegasus2 R4
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.374	38.7	132.1
Idle	230v/50Hz	0.256	38.3	130.8
Operation	110v/60Hz	0.483	45.5	155.3
Operation	230v/50Hz	0.326	45.9	156.7

Pegasus2 R2+ with CF/SD Reader Pod
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.251	24.2	82.6
Idle	230v/50Hz	0.129	24.3	82.9
Operation	110v/60Hz	0.255	27.2	92.9
Operation	230v/50Hz	0.142	27.3	93.2

Pegasus2 M4
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Spin down	110v/60Hz	0.180	18.8	64.2
Spin down	230v/50Hz	0.107	19.0	64.9
Idle	110v/60Hz	0.190	19.9	67.9
Idle	230v/50Hz	0.111	20.2	68.9
Operation	110v/60Hz	0.265	27.8	94.9
Operation	230v/50Hz	0.147	29.0	99.0

Pegasus R4 and R6 power consumption and thermal output

2013-12-18T09:11:27.0000000

Pegasus Power Consumption and Thermal Output values below are for Pegasus units with included factory installed hard disk drives.

Pegasus R4
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.435	46.6	159.0
Idle	230v/50Hz	0.311	46.1	157.3
Operation	110v/60Hz	0.483	52.0	177.5
Operation	230v/50Hz	0.326	50.1	171.0

Pegasus R6
Status	Input Voltage	Current (A)	Power Consumption (W)	Thermal Output (BTU/Hour)
Idle	110v/60Hz	0.536	58.0	198.0
Idle	230v/50Hz	0.349	54.2	185.0
Operation	110v/60Hz	0.579	63.3	216.0
Operation	230v/50Hz	0.369	59.2	202.0

Warning message of PD config change from Pass-Through to Un-Configured

2013-11-01T09:59:43.0000000

When installing a hard disk drive that has never been configured as part of a Promise Pegasus array, you get the choice of Pass-Through or Un-Configured. To use this disk in an array, the Pass-Through disk must be changed to Un-Configured.

Definition:

Pass-through (or PassThru) Disk

A disk which had not been configured as for use in an array. It could be a new blank disk or a used disk with data.
Pass-through drives are directly visible to your computer and are configured as individual drives.
Pass-Through disks cannot be used to make a disk array.

Un-configured (or Unconfigured) Disk

An unused disk which is ready for a RAID volume or for use as a spare disk for an array.
User can create a logical disk array on it or set it as a dedicated/global spare drive.
Unconfigured drives are not visible to your computer.

To change a pass-through disk to an un-configured disk:

From the Device menu, choose Physical Drive.
Mouse-over the physical drive you want then click the Settings button.
Make the change from PassThru to Unconfigured.
When making the change you will get a warning message:
The pass-through disk has a file system and may contain user data. Changing the status of the disk will delete all data and the file system used on the disk. Please type CONFIRM to change the HDD setting from Pass-Through to Un-configured.
If you are sure you do not need the data on this disk, please type CONFIRM in the space provided and then click the Confirm button.
The disk will change to Unconfigured and can now be used for creating a disk array and logical disk, or can be used as a hot spare disk drive.

See example image below:

What is the difference between Thunderbolt™ and Thunderbolt™ 2?

2013-10-30T09:45:03.0000000

The first generation Thunderbolt™ is limited to one independent 10Gbs bi-directional channel each for data and display.

**Thunderbolt™**
	How it works		Thunderbolt™ Cables

Thunderbolt™ 2 will enable 4K video file transfer and display simultaneously by combining the two previously independent 10Gbs channels into one 20Gbs bi-directional channel.

**Thunderbolt™ 2**

Thunderbolt™ 2 supports DisplayPort 1.2, which means it is possible to stream video to a single 4K monitor or dual QHD monitors.

There are no new cables required for use with Thunderbolt™ 2 as it utilizes the same Thunderbolt™ cables and connectors as the first generation.

For more information regarding Thunderbolt™ Technology, please go to: https://thunderbolttechnology.net/

Enabling Auto Updates on the Pegasus’s Promise Utility

2012-12-14T13:31:49.0000000

1: Click on the Promise Utility Menu and click on Preferences.

2: If the check box for the “Automatically check for updates” is grey, you will need to unlock the window by clicking on the lock on the lower left hand corner of the window.

3: You will be asked to authenticate using your local password. Insert your password and Click OK.

4: You will now be able to click on the check box to enable automatic updates. It will check for updates the next time you launch the utility.

5: If there is a software update, you will be asked to update the Promise Utility. If you click on Remind me Later, it will display pop up again after the next reboot. The Skip this version button will stop any further notifications on this utility update.

6: After downloading, you will be asked to confirm the install. Clicking the Install and Launch button will update and restart the utility.

7: You will be asked to authenticate using your system password to confirm the installation.

8: If there is a firmware update, you will be notified. If you are ready for the firmware update, click the Update button.

9: We recommend Ejecting the volume before proceeding with the firmware update.

10: You will be asked to authenticate with the computer password before downloading the new firmware.

11. After the firmware download completes, you will be asked to confirm the firmware update.

12: Clicking the submit button will bring up a confirmation window. This is because the Pegasus needs to reboot after the firmware update. As long as the volumes have been ejected, it is safe to type “CONFIRM” and click submit.

13: After the firmware update, it will prompt you to reboot the Pegasus. Please press the power button to shut it down when you're ready.

14: After you've shut down the machine, Pegasus will lose connection to the Promise Utility. The Promise Utility will pop up with an error. This is normal, click OK to close the error window.

15: Press the power button again to start it over. The power button will go from blue to orange, then to blue again. A stable blue on the power light means that Pegasus is back to work and you can resume Promise Utility. Volume should then be accessible.

16: You've upgraded Pegasus successfully.

My Pegasus disk icon does not show on the Desktop

2012-08-07T15:29:57.0000000

In OSX Lion and OSX Mountain Lion, sometimes the desktop is configured not to show the icon for the Promise RAID by default. This can give the impression the Pegasus is not being detected when it is plugged in.

To fix this please click on the Finder icon (or an unused section of the background), so that the “Finder” menu appears on the top of your screen. Click the word “Finder”.

Underneath it, click “Preferences…” Under the General tab, make sure the top two items are checked.

Once the “External disks” box is checked, the icon for the Promise Pegasus will appear.

If it is still not detected, then please check it in Disk Utility and Promise Utility, then contact Promise Technical Support.

New Updates for Promise Utility and for Pegasus Firmware will cause errors if the update is stopped halfway.

2012-05-01T13:48:20.0000000

Today (March 20, 2012), Promise Technology released the SR1 update for Promise Utility software as well as an update to the firmware inside the Pegasus. Both updates need to be run and the Pegasus restarted to ensure continued trouble-free operation of the Pegasus.

If you have not already been presented with this Update Screen when you run Promise Utility, then please click Promise Utility at the top, then click Check for Updates. The Utility will offer to update itself first. Click OK.

The software will download its update and install itself.

Once the update is successful, click the Restart button to refresh Promise Utility.

Once Promise Utility.app comes up, click “Promise Utility” and Click “Check For Updates” again. Promise Utility will notify that there is now an upgrade to the firmware inside the Pegasus.

Download this upgrade by clicking Update.

You will see this screen as the firmware image is downloading.

When the update is complete, click the Submit button as seen below.

Type in CONFIRM into the dialog box and click OK.

When you see the message below then the firmware is being loaded to the Pegasus internals.

The progress screen below indicates the image is being written to the Pegasus firmware.

You will see this when the flash is completed. Be sure to SHUT DOWN the PEGASUS now through the Utility or through pressing the Power button for 5 seconds.

Once you turn the Pegasus back on, it will be running the new firmware.

If you have any problems or questions, please do not hesitate to contact Promise eSupport at support.promise.com.

How do I select a specific Pegasus to manage from command line utility?

2011-10-19T15:53:39.0000000

Step 1: Start the PromiseUtil to enable the Pegasus command line interface.

Open a terminal window on your Mac.
Type promiseutil to start the Promise command line interface for Pegasus.
You will get an information screen showing each Pegasus system attached to your Mac.

[localhost:~] demo$ promiseutil

-------------------------------------------------------------
Promise Utility
Version: 3.16.0000.53 Build Date: Jun 17, 2011
-------------------------------------------------------------

List available RAID HBAs and Subsystems
=====================================================================
Type # Model Alias WWN
=====================================================================
hba 1 * Pegasus R6 2000-0001-5530-9404
hba 2 Pegasus R6 2000-0001-5530-9416
Totally 2 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 .

Step 2: Choosing which Pegasus is the currently active unit for command line instructions.

At the cliib> prompt, type: spath.
You will get an output similiar to this:

cliib> spath ===================================================================== Type # Model Alias WWN ===================================================================== hba 1 * Pegasus R6 2000-0001-5530-9404 hba 2 Pegasus R6 2000-0001-5530-9416 Totally 2 HBA(s) and 0 Subsystem(s) cliib>

The active Pegasus will be marked with a '*' symbol.
Use the spath command to change to a different Pegasus. In this example, we're going to choose Pegasus #2 above.
At the cliib> prompt, type: spath -a chgpath -t hba -p 2

cliib> spath -a chgpath -t hba -p 2

To verify the change, use the spath command again.

cliib> spath ===================================================================== Type # Model Alias WWN ===================================================================== hba 1 Pegasus R6 2000-0001-5530-9404 hba 2 * Pegasus R6 2000-0001-5530-9416 Totally 2 HBA(s) and 0 Subsystem(s)

Note now the '*' is on Pegasus #2. Now all command line instructions will operate on Pegasus #2 in the list.

What is the preferred order for attaching Pegasus RAID storage and a display via the Thunderbolt Port?

2011-10-05T13:56:19.0000000

Summary:

When connecting the Pegasus RAID storage enclosure and a display to the Thunderbolt chain, the connection order does matter.

For Apple Thunderbolt Display (27 inch):

First: Connect the Apple Thunderbolt Display directly to the Mac via the Thunderbolt port.

Next: Connect the Pegasus RAID storage enclosure to the Thunderbolt port on the Apple Thunderbolt Display.

Additional Information:

Apple Thunderbolt Display.

Apple knowledge base article HT4885: Thunderbolt display connection options.

For Mini DisplyPort displays, including displays connected via HDMI to Mini DisplayPort adapters:

First: Connect the Pegasus RAID storage enclosure directly to the Mac via the Thunderbolt Port.

Next: Connect the Mini DisplayPort display to the Thunderbolt port on the Pegasus RAID storage enclosure. DisplayPort displays must be on the end of the Thunderbolt chain.

Additional Information:

Apple knowledge base article HT4744: Mini DisplayPort display must be last in a Thunderbolt chain.

Why won't the Pegasus Promise Utility start on my Apple/Mac?

2011-09-16T15:54:07.0000000

KB 10314 - Why won't the Pegasus Promise Utility start on my Apple/Mac?

The Promise Utility service will not start if there is a mismatch in the Fully Qualified Domain Name (FQDN) when the Apache Server library unique_id_module loads. This issue has been identified and will be fixed in a future release.

To be able to launch the Pegasus Promise Utility, its daemon must be running. To start the daemon please do the following:

cd /Applications/Promise Utility.app/Contents/Resources/apache2/conf/httpd.conf:

Backup original file: cp httpd.conf httpd.conf.bak

Edit the file: sudo vi httpd.conf

Search the file for: LoadModule unique_id_module mod_unique_id.so

Stop the module from loading by adding the “#”: #LoadModule unique_id_module mod_unique_id.so

Note: By commenting this line out, Apache Server may be affected. However, if commenting this apache module out is not an option, please use the Command Line Interface (CLI). You can manage your Pegasus using CLI. To start CLI open a terminal shell window and enter ‘promiseutil’. For usage simply enter ‘?’

See the following link for more details: http://httpd.apache.org/docs/2.2/en/mod/mod_unique_id.html