Netbooting is too slow

Symptoms

• Netbooting is too slow
• It takes more than 30 minutes to get to Task Sequence window
• Netboot server and Mac are located in the same network

Cause

This behavior is observed if Mac from which image has been created has OS X version that is different from OS X version installed in Recovery partition.

You can check OS X versions by running pmm_osd_image_builder tool that is used to create a netboot image as described in Creating an OS X Boot Image at page 102 of Parallels Mac Management Administrator Guide:

Note: you can interrupt the process by pressing ctrl+c combination.

Resolution

Update Recovery partition to the latest build:

1. Disable System Integrity Protection (required only for OS X El Capitan and later):

   • Boot in recovery mode.
   • Open Terminal from the Utilities menu.

   • Execute the following command:

     csrutil disable
     

2. Reboot Mac.

3. Download the Lion Recovery Update from here in ~/Downloads folder on your Mac.

   Note: Although tool is called Lion, it will work on El Capitan fluently.

4. Download .app installer of OS X system that is currently installed on your Mac in ~/Downloads folder. We recommend updating OS X to the latest version available and then download installer from App Store.

5. Right click on the .app installer file > Show Package Contents. Go to Contents/SharedSupport/. Copy the InstallESD.dmg file in ~/Downloads folder.

6. Download recovery.sh script in ~/Downloads folder.

7. Open Terminal and give execute permissions to downloaded script:

   sudo chmod +x ~/Downloads/recovery.sh
   

8. Run Recovery update

   cd ~/Downloads
   sudo ./recovery.sh
   

9. Wait till update is finished and reboot Mac.

10. Now you can create a Netboot image following Creating an OS X Boot Image at page 102 of Parallels Mac Management Administrator Guide