The following are possible conditions under which the Fast Reboot feature might not work:
Driver does not implement the quiesce function
If you attempt a fast reboot of a system with an unsupported driver, a message similar to the following is displayed:
Sep 18 13:19:12 too-cool genunix: WARNING: nvidia has no quiesce() reboot: not all drivers have implemented quiesce(9E)
If the graphics drivers are the only drivers that do not support the quiesce function, you can attempt to force a fast reboot by running the following commands:
# echo "force_fastreboot/W 1" | mdb -kw # echo "set force_fastreboot = 1" >> /etc/system
If the driver for the Network Interface Card (NIC) does not implement the quiesce function, you can try to unplumb the interface first, then attempt a fast reboot of the system.
# ifconfig your-nic-interface unplumb # reboot -f
If there is not enough memory on the system, below 1G (0x40000000) for building the page tables, or not enough free memory to load the new kernel and the boot archive, the fast reboot attempt fails with the following messages, then falls back to a regular reboot.
Fastboot: Couldn't allocate size below PA 1G to do fast reboot Fastboot: Couldn't allocate size below PA 64G to do fast reboot
Fast reboot functionality is not currently supported in the following environments:
Solaris xVM dom0 domains
Solaris xVM PV domU domains