From owner-freebsd-small Thu Apr 19 16: 9:20 2001 Delivered-To: freebsd-small@freebsd.org Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66]) by hub.freebsd.org (Postfix) with ESMTP id EE46837B422 for ; Thu, 19 Apr 2001 16:09:17 -0700 (PDT) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.11.3/8.11.1) with ESMTP id f3JN9F807969; Thu, 19 Apr 2001 17:09:15 -0600 (MDT) (envelope-from imp@harmony.village.org) Message-Id: <200104192309.f3JN9F807969@harmony.village.org> To: Darryl Okahata Subject: Re: The ultimate board! Cc: freebsd-small@FreeBSD.ORG In-reply-to: Your message of "Thu, 19 Apr 2001 15:26:32 PDT." <200104192226.PAA21832@mina.soco.agilent.com> References: <200104192226.PAA21832@mina.soco.agilent.com> Date: Thu, 19 Apr 2001 17:09:15 -0600 From: Warner Losh Sender: owner-freebsd-small@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <200104192226.PAA21832@mina.soco.agilent.com> Darryl Okahata writes: : > Based on 10e5 writes per block, 8k blocks and 5M of available space, 1 : > write per second is about 723 days, assuming even wear on each of the : > available blocks (unless I've messed up my calculations). That puts : > it at two years. one write per minute would be 120 years and one : > write per hour would be 7200 years. : : ... but, you can't assume even wear. Don't directory entries, : etc., get written in the same place, over and over? What about : superblocks? The hardware does remapping behind the scenes so that wear is averaged over the set of blocks that change. On a 16M part, there would be about 5M free/changing in the average system, so teh calcuations would hold for that. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message