Accton Technology ES4626 - Manual (Page 63)

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view. The other two channels---the log buffer zone and log host channel are two
important channels
SDRAM (Synchronous Dynamic Random Access Memory) and NVRAM (Non
Vulnerable Random Access Memory) is provided inside the switch as two part of the log
buffer zone, The two buffer zone record the log information in a circuit working pattern,
namely when log information need to be recorded exceeds the buffer size, the oldest log
information will be erased and replaced by the new log information, information saved in
NVRAM will stay permanently while those in SDRAM will lost when the system restarts or
encounter an power failure. Information in the log buffer zone is critical for monitoring the
system operation and detecting abnormal states.
Note: the NVRAM log buffer may not exist on some switches, which only
have the SDRAM log buffer zone
It is recommended to use the system log server. By configuring the log host
on the switch, the log can be sent to the log server for future examination
2.2.9.1.2 Format And Severity Of The Log Information
The log information format is compatible with the BSD syslog protocol, so we can
record and analyze the log by the systlog (system log protect session) on the
UNIX/LINUX, as well as syslog similar applications on PC.
The log information is classified into eight classes by severity or emergency
procedure. One level per value and the higher the emergency level the log information
has, the smaller its value will be. For example, the level of critical is 2, and warning is 4,
debugging is leveled at 7, so the critical is higher than warnings which no doubt is high
than debugging. The rule applied in filtering the log information by severity level is that:
only the log information with level equal to or higher than the threshold will be outputted.
So when the severity threshold is set to debugging, all information will be outputted and if
set to critical, only critical, alerts and emergencies will be outputted.
Follow table summarized the log information severity level and brief description.
Note: these severity levels are in accordance with the standard UNIX/LINUX syslog
Severity Value Description
emergencies 0
System is unusable
alerts 1
Action must be taken immediately
critical 2
Critical conditions
errors 3
Error conditions
warnings 4
Warning conditions
notifications 5
Normal but significant condition