Extreme Networks ExtremeWare XOS 11.3, Руководство пользователя

Страница: 105 / 698

Understanding Memory Protection
ExtremeWare XOS 11.3 Concepts Guide
105
Starting a Process
To start a process, use the following command:
start process <name> {msm <slot>}
Where the following is true:
●
name
—Specifies the name of the process.
●
slot
—Specifies the slot number of the MSM. A specifies the MSM installed in slot A. B specifies the
MSM installed in slot B. (This parameter is available only on modular switches.)
You are unable to start a process that is already running. If you try to start a currently running process,
for example
telnetd , an error message similar to the following appears:
Error: Process telnetd already exists!
As described in the section, “Stopping a Process” on page 104 , you can use a single command, rather
than multiple commands, to stop and restart a running process. To stop and restart a process during a
software upgrade, use the following command:
restart process [class <cname> | <name> {msm <slot>}]
For more detailed information, see the previous section or the ExtremeWare XOS Command Reference
Guide . omm
Understanding Memory Protection
ExtremeWare XOS provides memory management capabilities. With ExtremeWare XOS, each process
runs in a protected memory space. This infrastructure prevents one process from overwriting or
corrupting the memory space of another process. For example, if one process experiences a loop
condition, is under some type of attack, or is experiencing some type of problem, that process cannot
take over or overwrite another processes’ memory space.
Memory protection increases the robustness of the system. By isolating and having separate memory
space for each individual process, you can more easily identify the process or processes that experience
a problem.
To display the current system memory and that of the specified process, use the following command:
show memory process <name> {slot <slotid>}
Where the following is true:
●
name
—Specifies the name of the process.
●
slot
—Specifies the slot number of the MSM. A specifies the MSM installed in slot A. B specifies the
MSM installed in slot B. (This parameter is available only on modular switches.)
The
show memory process
command displays the following information in a tabular format:
●
System memory information (both total and free).
●
Current memory used by the individual processes.