Troubleshooting Issues With Fast Reboot on the x86 Platform

The following sections describe how to identify and resolve some common issues that you might encounter with the Fast Reboot feature of Oracle Solaris on x86 platforms.

Debugging Early Panics That Might Occur

Because the boot-config service has dependencies on the multiuser milestone, users who need to debug early panics can patch a global variable, fastreboot_onpanic in the /etc/system file, as shown in the following example:

# echo "set fastreboot_onpanic=1" >> /etc/system
# echo "fastreboot_onpanic/W" | mdb -kw

Troubleshooting Conditions That Might Prevent Fast Reboot From Working on x86 Platforms

The following are possible conditions under which the Fast Reboot feature might not work:

• The GRUB menu cannot be processed.

• The 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_fast \
  reboot = 1" #x26;#x26;#x3e;#x26;#x26;#x3e; /etc/system

  ---

  Note - If the driver for the network interface card (NIC) does not implement the quiesce function, try to unplumb the interface first, then attempt a fast reboot of the system.

  ---

• There is insufficient memory.

  If there is not enough memory on the system, 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

• The environment is unsupported.

  Fast reboot functionality is not supported in the following environments:

  • An Oracle Solaris release that is running as a paravirtualized (PV) guest domain

  • Non-global zones

For more information, see the following man pages:

• reboot(1M)

• init(1M)

• quiesce(9E)

• uadmin(2)

• dev_ops(9S)