Process Restartability - Dell Force10 S4810P Configuration Manual

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FTOS#

Process Restartability

Process Restartability is an extension to the FTOS high availability system component that enables
application processes and system protocol tasks to be restarted. This extension increases system reliability
and uptime by attempting to restart the crashed process on primary RPM before executing the failover
procedure as a last resort.
Currently, if a software exception occurs, FTOS executes a failover procedure. In a single-RPM system,
the system generates a coredump and reboots; in a dual-RPM system, the system generates a coredump and
fails over to the standby RPM.
With a system reload, the system must read and apply the entire startup-config file, which might take some
time if the startup-config is large. Restarting a process saves time because only a portion of the
configuration related to the crashed process is read and re-applied.
For a dual-RPMs system, restarting a process also precludes launching the failover process on the primary
and standby RPMs. Recovery is attempted first locally on the primary RPM, which involves less CPU
overhead, increasing the systems availability for other activities.
However, in both single and dual-RPM systems, even when Process Restart is configured, the coredump
portion of failover is still executed.
The processes that can be restarted fall under three categories:
• Interface-related processes—TACACS+, RADIUS, CLI, and SSH, etc.
• Protocol tasks—OSPF, RIP, and ACL, etc. Process Restart is not currently available for protocol
tasks; the failover procedure is executed immediately upon software exception.
• Line card processes—IPC, Event Log Agent, Line Card Manager, etc. Process Restart is not currently
available for line card processes; the failover procedure is executed immediately upon software
exception.
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High Availability | 457