Sun Microsystems Netra 1290, Руководство администратора

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Appendix A Dynamic Reconfiguration 97
Suspend-Safe and Suspend-Unsafe Devices
When DR suspends the operating system, all of the device drivers that are attached
to the operating system must also be suspended. If a driver cannot be suspended (or
subsequently resumed), the DR operation fails.
A suspend-safe device does not access memory or interrupt the system while the
operating system is in quiescence. A driver is suspend-safe if it supports operating
system quiescence (suspend/resume). A suspend-safe driver also guarantees that
when a suspend request is successfully completed, the device that the driver
manages will not attempt to access memory, even if the device is open when the
suspend request is made.
A suspend-unsafe device enables a memory access or a system interruption to occur
while the operating system is in quiescence.
Attachment Points
An attachment point is a collective term for a board and its slot. DR can display the
status of the slot, the board, and the attachment point. The DR definition of a board
also includes the devices connected to it, so the term
occupant refers to the
combination of board and attached devices.
■
A slot (also called a receptacle) has the ability to electrically isolate the occupant
from the host machine. That is, the software can put a single slot into low-power
mode.
■
Receptacles can be named according to slot numbers or can be anonymous (for
example, a SCSI chain). To obtain a list of all available logical attachment points,
use the
-l
option with the
cfgadm
(1M) command.
There are two formats used when referring to attachment points:
■
A physical attachment point describes the software driver and location of the slot.
An
example of a physical attachment point name is:
where:
■
N0–
is node 0 (zero)
■
SB–
is a system board
■
x– is a slot number. A slot number can be 0, 2 or 4 for a system board
■
A logical attachment point is an abbreviated name created by the system to references
the physical attachment point. Logical attachment points take the following form:
/devices/ssm@0,0:N0.SB
x