From owner-freebsd-questions Tue May 22 0:48:16 2001 Delivered-To: freebsd-questions@freebsd.org Received: from guru.mired.org (okc-65-26-235-186.mmcable.com [65.26.235.186]) by hub.freebsd.org (Postfix) with SMTP id 2E55F37B422 for ; Tue, 22 May 2001 00:48:14 -0700 (PDT) (envelope-from mwm@mired.org) Received: (qmail 33526 invoked by uid 100); 22 May 2001 07:48:13 -0000 From: Mike Meyer MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15114.6589.262955.23712@guru.mired.org> Date: Tue, 22 May 2001 02:48:13 -0500 To: Tim Erlin Cc: questions@freebsd.org Subject: Downtime (Was: uptime limits) In-Reply-To: <87633656@toto.iv> X-Mailer: VM 6.90 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\ Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Tim Erlin types: > Wouldn't a more meaningful measure be downtime? Has > anyone put together info on how much downtime, as a > percentage, is required for regular > upgrades/maintanence for different OSes. That would > allow one to distinguish between downtime that's > expected and downtime that isn't (e.g. crashes). > > I would think that would be an important distinction. Scheduled downtime isn't that big a deal - it should be part of the plan. You can warn users, provide alternatives, and such like. It is important in the planning stages, because having lots of it raises the cost of the system. Unscheduled downtime is the one that's really interesting, because it's the one that pisses users off, and otherwise results in unexpected expenses. I've been at organizations that tracked all that, but it's been long enough ago (~BSD 4.2) that the information isn't really relevant. They also tracked load average and disk usage, so they intelligently budget more processors and disks. Both of these seem to be a rarity in the networked shops I've been at since. http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message