The cpr module is a loadable module used to suspend and resume the entire system. You may wish to suspend a system to save power or to power off temporarily for transport. The cpr module should not be used in place of a normal shutdown when performing any hardware reconfiguration or replacement. In order for the resume operation to succeed, it is important that the hardware configuration remain the same. When the system is suspended, the entire system state is preserved in non-volatile storage until a resume operation is conducted.
dtpower(1M) or power.conf(4) are used to configure the suspend-resume feature.
The speed of suspend and resume operations can range from 15 seconds to several minutes, depending on the system speed, memory size, and load.
During resume operation, the
signal is sent to all processes to allow them to do any special processing
in response to suspend-resume operation. Normally applications are not required
to do any special processing because of suspend-resume, but some specialized
processes can use
SIGTHAW to restore
the state prior to suspend . For example, X can refresh
the screen in response to
In some cases the cpr module may be unable to perform the suspend operation. If a system contains additional devices outside the standard shipped configuration, it is possible that device drivers for these additional devices might not support suspend-resume operations. In this case, the suspend will fail and an error message will be displayed. These devices must be removed or their device drivers unloaded for the suspend operation to succeed. Contact the device manufacturer to obtain a new version of device driver that supports suspend-resume.
A suspend may also fail when devices or processes are performing critical or time-sensitive operations (such as realtime operations). The system will remain in its current running state. Messages reporting the failure will be displayed on the console and status returned to the caller. Once the system is successfully suspended the resume operation will always succeed, barring external influences such as a hardware reconfiguration.
Some network-based applications may fail across a suspend and resume cycle. This largely depends on the underlying network protocol and the applications involved. In general, applications that retry and automatically reestablish connections will continue to operate transparently on a resume operation; those applications that do not will likely fail.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
Using Power Management
Certain device operations such as tape and floppy disk activities are not resumable due to the nature of removable media. These activities are detected at suspend time, and must be stopped before the suspend operation will complete successfully.
Suspend-resume is currently supported only on a limited set of hardware platforms. Please see the book Using Power Management for a complete list of platforms that support system Power Management. See uname(2) to programatically determine if the machine supports suspend-resume.
In extremely rare occasions, the system may fail during the early stages of a resume operation. In this small window it is theoretically possible to be stuck in a loop such that the system does not resume and does not boot normally. If you are in such a loop, get to the PROM ok prompt using the L1+A keys and enter the following command:
<ok> set-default boot-file
This command resets the system and with the next power-on the system will boot normally.