Firewall Wizards mailing list archives
Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . .
From: Devdas Bhagat <devdas () dvb homelinux org>
Date: Thu, 13 Apr 2006 04:43:57 +0530
On 12/04/06 14:51 -0700, David Lang wrote: <snip>
but if you can accept latencies of hours then you have a lot of leeway to spread your peaks out and your peak bandwidth can be far closer to your average bandwidth, so your statement that the peak is 20-30x the average doesn't sound reasonable. what am I missing here?
The peak load is generated by the injection of a message. This can take the form of a single message to multiple recipients, or one message per recipient. If marketing purposes are involved, the second is the norm. When you smack a few thousand messages into a queue, the MTA tries to push them all out simultaneously. This creates a choke, causing minutes worth of latency. Remote MTAs may be down, or they may have greylisting enabled, in which case the delay increases even more. Mail flow typically looks like (actually it looks worse, but those details can be ignored for the moment) ______ <----- Network saturated. | \ ________| \______________/\____________________ Typically, you do not want the second smaller peak at all, but that can be lived with. More mail clogging the queue is a bad idea. For a good list, something like 99% will go through in the first blast. The hours of delay are exceptional and preferably avoided. Devdas Bhagat _______________________________________________ firewall-wizards mailing list firewall-wizards () honor icsalabs com http://honor.icsalabs.com/mailman/listinfo/firewall-wizards
Current thread:
- RE: Info Request: Looking for alternatives in HA/Load balancingfirewalls that are also scalable and modular. . ., (continued)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . David Lang (Apr 09)
- RE: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Keith A. Glass (Apr 09)
- RE: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . David Lang (Apr 09)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Oliver Humpage (Apr 12)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . David Lang (Apr 13)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Devdas Bhagat (Apr 12)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . David Lang (Apr 13)
- Re: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Devdas Bhagat (Apr 13)
- RE: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Keith A. Glass (Apr 09)
- RE: Info Request: Looking for alternatives in HA/Load balancing firewallsthat are also scalable and modular. . . Paul Melson (Apr 26)