svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
cpr(4)
Device and Network Interfaces cpr(4)
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 might 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 reconfigura‐
tion 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.
poweradm(8) is 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 can be unable to perform the suspend oper‐
ation. 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 fails and an error message is displayed. These
devices must be removed or their device drivers unloaded for the sus‐
pend operation to succeed. Contact the device manufacturer to obtain a
new version of device driver that supports suspend-resume.
A suspend can also fail when devices or processes are performing criti‐
cal or time-sensitive operations (such as realtime operations). The
system remains in its current running state. Messages reporting the
failure are displayed on the console and status returned to the caller.
Once the system is successfully suspended the resume operation suc‐
ceeds, barring external influences such as a hardware reconfiguration.
Some network-based applications can 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 automat‐
ically reestablish connections continues to operate transparently on a
resume operation; those applications that do not likely fails.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/kernel/suspend-resume _ Interface
StabilityUncommitted
SEE ALSO
attributes(7), poweradm(8)
NOTES
Certain device operations such as tape activities are not able to be
resumed due to the nature of removable media. These activities are
detected at suspend time, and must be stopped before the suspend opera‐
tion completes 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
programmatically determine if the machine supports suspend-resume.
Oracle Solaris 11.4 13 Nov 2020 cpr(4)