Snow Leopard Server: Booting Up With 32 or 64 Bit Kernel

Snow Leopard Server (SLS) has built in 32-bit and 64-bit kernel. You can choose to boot up with 32 or 64 bit kernel by using the following two methods.

Method 1:

• Booting up your Mac and holding "6" and "4" key, the server will boot up with 64-bit kernel.
• Booting up your Mac and holding "3" and "2" key, the server will boot up with 32-bit kernel.

Your Mac will revert to the default kernel (32-bit) next time you boot up.

Method 2:

• The following command will change the default kernel to 64-bit.

sudo systemsetup -setkernelbootarchitecture x86_64

• The following command will change the default kernel to 32-bit.

sudo systemsetup -setkernelbootarchitecture i386

This method will change the default boot kernel and will take effect every time when start up.