Performance issue ( maybe )

Tom Schmitt TomSchmitt at gmx.de
Mon Sep 6 12:26:35 UTC 2010


> Von: Bjarne Blichfeldt <bjb at jndata.dk>
> Betreff: RE: Performance issue ( maybe )


> No, but I have noticed that the all the balancing lines seems to be
> duplicated :
> Sep  3 06:53:40 b00011100859 dhcpd: balancing pool 9c8de78 10.229.16.0/24 
> total 248  free 124  backup 124  lts 0  max-own (+/-)25
> Sep  3 06:53:40 b00011100859 dhcpd: balanced pool 9c8de78 10.229.16.0/24 
> total 248  free 124  backup 124  lts 0  max-misbal 37

These are no duplicates, this is the normal behaviour:
1 line balancing
1 line balanced



> And one (of many different) specific :
> Sep  3 08:19:53 b00011100859 dhcpd: balanced pool 8a552c0 10.20.65.0/24 
> total 199  free 102  backup 88  lts 7  max-misbal 29
> Sep  3 08:20:56 b00011100859 dhcpd: balanced pool 8a552c0 10.20.65.0/24 
> total 199  free 102  backup 88  lts 7  max-misbal 29
> Sep  3 08:21:50 b00011100859 dhcpd: balanced pool 8a552c0 10.20.65.0/24 
> total 199  free 102  backup 88  lts 7  max-misbal 29

This is a very short timeframe (one minute) between your logline. Afaik there are two reasons you get all these balance-lines: If one of the servers is doing a restart or on a regulary basis, depending what time-values you have configured in your failover paragrahp.

One minute is okay if you only have a few subnets. But if you have a bigger amount of subnets you should consider a higher value. For example, I have set this value to 2 hours.


Only to negate the other possibility: 
Are you sure, one of your server isn't constantly restarting? For example, your second dhcp-server has a corrupt RAM and the dhcpd is sefaulting and crashing but some kind of monitor-process is immideately restarting it.
This would result in a picture you saw.
(And because you only looked in the logfile of the first server you didn't saw the restarting messages.... :-)  
Okay, far fetched.


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