A10 Health Monitors

This post is an equivalence check of A10 vs ACE probes/health monitors.

    ACE

ACE-A# show probe

probe : tcp-3121-probe-1
type : TCP
state : ACTIVE
----------------------------------------------
port : 3121 address : 0.0.0.0 addr type : -
interval : 10 pass intvl : 30 pass count : 2
fail count: 2 recv timeout: 5

--------------------- probe results --------------------
probe association probed-address probes failed passed health
------------------- ---------------+----------+----------+----------+-------
serverfarm : vip-11.95.79.90_3121
real : ip-11.95.79.68[3121]
11.95.79.68 1286028 1104 1284924 SUCCESS

interval – the time period health checks for a healthy server are sent
pass intvl – the time period health checks for a server marked “DOWN” are sent
pass count – the number of successful probes required to mark a server as “UP”
fail count – the number of unsuccessful probes required to mark a server as “DOWN”
recv timeout – timeout before a probe fails


a10-1[test-1]#show health monitor
Idle = Not used by any server In use = Used by server
Attrs = Attributes G = GSLB
Monitor Name Interval Retries Timeout Up-Retries Method Status Attrs
---------------------------------------------------------------------------------
tcp-443-monitor-1 30 2 5 2 TCP In use

Interval – the time period health checks for a healthy server are sent
Up-Retries – the number of successful probes required to mark a server as “UP” after it has come back fro a “DOWN” state.

The A10 has no concept of a “pass-interval” unlike the ACE. So the same time periods used for probes to servers in an “UP” state are used for those in a “DOWN” state. This is not going to matter 9 times out of 10, because the A10 is a lot beefier than an ACE. Probe overhead is not a lot. However, it does throw up errors if you’re using a conversion tool.

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