From owner-freebsd-hackers Thu Mar 5 02:29:25 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id CAA21447 for freebsd-hackers-outgoing; Thu, 5 Mar 1998 02:29:25 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from heron.doc.ic.ac.uk (SNvVIyOyISPeVBxgmkIB6UYAeN5F+4MM@heron.doc.ic.ac.uk [146.169.2.31]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id CAA21440 for ; Thu, 5 Mar 1998 02:29:21 -0800 (PST) (envelope-from njs3@doc.ic.ac.uk) Received: from oak67.doc.ic.ac.uk [146.169.33.67] ([gl+HtTgJOkEhNWn1LOKt6shpo5izPD+q]) by heron.doc.ic.ac.uk with smtp (Exim 1.62 #3) id 0yAXtW-0002kB-00; Thu, 5 Mar 1998 10:28:54 +0000 Received: from njs3 by oak67.doc.ic.ac.uk with local (Exim 1.62 #3) id 0yAXsq-0005qk-00; Thu, 5 Mar 1998 10:28:12 +0000 From: njs3@doc.ic.ac.uk (Niall Smart) Date: Thu, 5 Mar 1998 10:28:11 +0000 In-Reply-To: Tom "Re: Cluster?" (Mar 4, 9:48am) X-Mailer: Mail User's Shell (7.2.5 10/14/92) To: Tom , Niall Smart Subject: Re: Cluster? Cc: "Ron G. Minnich" , Alex Povolotsky , hackers@FreeBSD.ORG Message-Id: Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Mar 4, 9:48am, Tom wrote: } Subject: Re: Cluster? > On Wed, 4 Mar 1998, Niall Smart wrote: > > of months from now though. One particular thing that could benefit > > easily from this are DNS servers, other servers like mail and news wouldn't > > DNS? DNS already has excellent fault-tolerant capabilities. I should have mentioned that I was had dynamic DNS in mind, in this scenario the two (or n) DNS servers could share the data structures in a shared memory region so that an update by any would be reflected in the address spaces of all the others. I agree that DNS has fault tolerant capabilities but I wouldn't call them excellent, its annoying to have to wait for requests to the primary to time out before the resolver library starts hitting on the secondaries. > > be so easy, because of the need for a reliable shared filesystem. Plus > > there is the problem of how to get clients of these servers to contact > > the redundant one in the event of a failure, I think someone has done > > something in this area using proxy arp... > > This is the important bit. IP address assumption is critical. Some > clusters do it by assuming the MAC address to ensure an instant > transition. Hmm, thats an interesting one, can most cards be programmed to accept frames with specific MAC's? Niall To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message