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OpenSolaris 2009.06 - man page for cpr (opensolaris section 7)

cpr(7)				  Device and Network Interfaces 			   cpr(7)

NAME
       cpr - Suspend and resume module

SYNOPSIS
       /platform/'uname -m'/kernel/misc/cpr

DESCRIPTION
       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 impor-
       tant  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  con-
       ducted.

       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 SIGTHAW 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 SIGTHAW.

       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   opera-
       tions.  In  this  case, the suspend fails and an error message is 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-sensi-
       tive  operations (such as realtime operations). The system will remain in its current run-
       ning 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 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.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcpr			   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       dtpower(1M)   (OpenWindows   Reference	Manual),   pmconfig(1M),  uadmin(1M),  uadmin(2),
       power.conf(4), attributes(5)

       Using Power Management

       Writing Device Drivers

NOTES
       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  sus-
       pend-resume.

SunOS 5.11				    7 May 2001					   cpr(7)


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