Date: Mon, 22 Mar 1999 11:45:59 -0500 From: "Gary Palmer" <gpalmer@FreeBSD.ORG> To: "Cyril A. Vechera" <cyril@main.piter.net> Cc: julian@whistle.com, cmsedore@maxwell.syr.edu, freebsd-net@FreeBSD.ORG Subject: Re: clustering/load balancing Message-ID: <60695.922121159@gjp.erols.com> In-Reply-To: Your message of "Mon, 22 Mar 1999 11:07:20 %2B0300." <199903220807.LAA06347@main.piter.net>
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"Cyril A. Vechera" wrote in message ID <199903220807.LAA06347@main.piter.net>: > > in the original scheme 'single point of failure' is still present. > > +-------[Machine B] > | > [internet]-----[ any router ]----+-------[Machine C] > | > +-------[Machine D] > ^^^^^^^^^ > > or maybe you can see other way to connect 'internet' to Machine [B-C]? There are many ways of doing it... Just very few ways that remove the SPoF all the way to the host. HSRP'd routers and per-packet load balancing have reduced a lot of the router based failures that could happen, but that still doesn't remove the SPoF in the switch/hub between the routers and the hosts. As I said in a previous message, Alteon have failover between switches, although it probably requires their GigE cards to go to the host and have that work. > what is the differense between 'any router' failures and 'balance > dispatcher' failures? I added a smiley to the end of the message for a reason. There are solutions to most of the other SPoFs that are out there today. The biggest one still left is actually not the one I highlighted, but rather: +-------[Machine B] | [internet]-----[ any router ]----+-------[Machine C] | +-------[Machine D] ^^^^^^^^^^^^ Anyone know of any way to have redudancy all the way to the host? (i.e. 2 or more NICs) Its going to need some daemon on the host watching the NIC for a heartbeat or something, then sending out an ARP invalidation packet for the (now failed) NIC and then another ARP for the (now working) NIC. Gary -- Gary Palmer FreeBSD Core Team Member FreeBSD: Turning PC's into workstations. See http://www.FreeBSD.ORG/ for info To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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