From owner-freebsd-isp Wed Apr 24 13: 8:18 2002 Delivered-To: freebsd-isp@freebsd.org Received: from bilver.wjv.com (spdsl-033.wanlogistics.net [63.209.115.33]) by hub.freebsd.org (Postfix) with ESMTP id 53A2A37B41E for ; Wed, 24 Apr 2002 13:08:12 -0700 (PDT) Received: (from bv@localhost) by bilver.wjv.com (8.11.6/8.11.6) id g3OK7q390228 for freebsd-isp@freebsd.org; Wed, 24 Apr 2002 16:07:52 -0400 (EDT) (envelope-from bv) Date: Wed, 24 Apr 2002 16:07:52 -0400 From: Bill Vermillion To: freebsd-isp@freebsd.org Subject: Re: HTTP Load Balancing and Availability Solutions Message-ID: <20020424200752.GF89347@wjv.com> Reply-To: bv@wjv.com References: <1019656776.38204.17.camel@xyzzy.intranet.snsonline.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.25i Organization: W.J.Vermillion / Orlando - Winter Park 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 -segmentation fault- press any key to reboot Damn damn damn Tom Samplonius said, after restarting his PC and mailer on Wed, Apr 24, 2002 at 08:31 . > > 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. Five nines. 99.99999 is the standard for telcos, etc. The highend bank machines such as Tandem are often speced to six 9's. Now THAT is serious. -- Bill Vermillion - bv @ wjv . com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message