H-Sphere requires that FreeBSD kernel be compiled with quota enabled. To update kernel on a FreeBSD server in an H-Sphere cluster:

1. Download and install FreeBSD kernel sources.

2. Under root, change directory to /usr/src/sys/i386/conf, where the kernel source is located:

   # cd /usr/src/sys/i386/conf

3. In this directory, you will have the default GENERIC kernel configuration file, and, if the custom kernel compilation has been performed, a custom kernel configuration file, for example MYKERNEL.

4. Open your current kernel configuration file (for example MYKERNEL) and add the line:

   options QUOTA
   Important: We don't recommend modifying the default GENERIC file. Instead, copy its content to a custom file (like MYKERNEL) and perform modifications there!

5. Compile and install the kernel:
   

   # /usr/sbin/config MYKERNEL
   # cd ../../compile/MYKERNEL
   # make depend
   # make
   # make install

6. Reboot FreeBSD server to activate the new kernel settings.

For more information, see generic instructions on Building and Installing a Custom Kernel.