From owner-freebsd-isp Wed Apr 24 9:25:39 2002 Delivered-To: freebsd-isp@freebsd.org Received: from misery.sdf.com (misery.sdf.com [207.200.153.226]) by hub.freebsd.org (Postfix) with ESMTP id A4D7E37B41B for ; Wed, 24 Apr 2002 09:25:22 -0700 (PDT) Received: from tom (helo=localhost) by misery.sdf.com with local-esmtp (Exim 2.12 #1) id 170Ojz-0004LY-00; Wed, 24 Apr 2002 08:31:31 -0700 Date: Wed, 24 Apr 2002 08:31:08 -0700 (PDT) From: Tom Samplonius To: Mark Sergeant Cc: bv@wjv.com, freebsd-isp@FreeBSD.ORG Subject: Re: HTTP Load Balancing and Availability Solutions In-Reply-To: <1019656776.38204.17.camel@xyzzy.intranet.snsonline.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On 24 Apr 2002, Mark Sergeant wrote: > 99.999 is less than an hours down time per year which running off one ... I don't get that: 365 days per year x 24 hours per day x 60 minutes per hour = 525,600 minutes per year 525,600 minutes per year x 0.001 percent down = 525.6 minutes per year down I think you might be thinking of 99.9999% reliability, which would be 52.5 minutes per year. Usually, when I hear people talk about 4 nine reliability, they are talking about the decimal portion. I believe banks and telephone companies operate on a 4 nines reliability basis. Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message