From owner-freebsd-isp Sat Jul 8 10:49:34 2000 Delivered-To: freebsd-isp@freebsd.org Received: from misery.sdf.com (misery.sdf.com [204.244.213.49]) by hub.freebsd.org (Postfix) with ESMTP id 3AC2E37B88C for ; Sat, 8 Jul 2000 10:49:31 -0700 (PDT) (envelope-from tom@sdf.com) Received: from tom (helo=localhost) by misery.sdf.com with local-esmtp (Exim 2.12 #1) id 13AyPo-0003j8-00; Sat, 8 Jul 2000 10:29:20 -0700 Date: Sat, 8 Jul 2000 10:29:17 -0700 (PDT) From: Tom Samplonius To: "R.I.Pienaar" Cc: Gabriel Ambuehl , Jason Fesler , Luigi Rizzo , Chris Shenton , Alan Batie , isp@FreeBSD.ORG Subject: Re: load balancing In-Reply-To: <20000708183736.A16123@pinetec.co.za> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sat, 8 Jul 2000, R.I.Pienaar wrote: > On Sat Jul 08, 2000 at 08:58:17AM -0700, Tom Samplonius wrote: > > > > Foundry Networks makes a load-balancer box that is able to keep itself > > synced with another unit for both fail-over and load-balancing. The unit > > balances requests to whatever backend servers you have, and if one of the > > backend servers croaks, the Foundry unit stops sending requests to it. > > This solution give you complete backend and frontend redunancy. > > how does it monitor the boxes behind the load blanacer, when does it find out > that your box died and its ment to failover? Because the backend server will no longer respond! Remember load-balancers are just fancy NAT boxes. If a request is translated, and there is no response, the server is dead. Load-balances like those from Foundry Networks also measure the response time. If a particular backend server starts to respond more slowly, the load-balancer will give it less requests. Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message