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--- design:snmpdaemon [2006/01/31 00:06] – Ueli Heuer
+++ design:snmpdaemon [2009/02/16 22:08] (current) – Ueli Heuer
@@ Line 1: / Line 1: @@
+====== Polling Daemon ======
+DVG polls the devices either by crontab (exec_rrd.pl) or by an experimental daemon (dvg_snmpd.pl). The problem is - if you use a large installation - the I/O load on the Server. Within a short time all rrd-files are updated and in the same time a lot of updates need to be written to the database.
+===== new polling daemon =====
+the new daemon should use multitasking (threads) to distribute the load over the time.
+==== requirements / wishes ====
+Other things the new daemon should do:
+  * periodic check the database for new devices (and hosts, locations) (or some notification if someone changes the config, via front- or any back-end-program)
+  * periodic check for changed parameter. (or some notification if someone changes a parameter, via front- or any back-end-program)
+  * track the state of a host, at least it should know  about following states: up, down, reboot/restart, reachable
+  * track the state of a device, at least it should know  about following states: up, down, shutdown
+  * notification of the owner
+  * alarm levels would be nice. if an interface shows some errors, has some unusual drops it would be nice if there are some alarms
+  * it should be possible to add modules. so the program exec_rrd.pl [exec|modules] is not needed anymore.
+**are there more needs**
+==== Frameworks ====
+Possible Libraries for the implementation: [[wikipedia>Perl_Object_Environment]].
+**Are there other possibilities?**
+==== Structures ====
+is this a good separation of the different tasks?
+  * one thread/POE::session to check the database?
+  * create for each host a thread/POE::session?
+open items:
+  * what if the connection to the database is lost? (snmpd.pl needs to restart)
+  * communication between the threads specially between the config reader and poller-threads?
+{{tag>design snmp daemon}}

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