From owner-freebsd-small Thu Apr 19 15:26:42 2001 Delivered-To: freebsd-small@freebsd.org Received: from msgbas1.cos.agilent.com (msgbas1x.cos.agilent.com [192.6.9.33]) by hub.freebsd.org (Postfix) with ESMTP id 31FDC37B422 for ; Thu, 19 Apr 2001 15:26:39 -0700 (PDT) (envelope-from darrylo@soco.agilent.com) Received: from msgrel1.and.agilent.com (msgrel1.and.agilent.com [130.30.33.104]) by msgbas1.cos.agilent.com (Postfix) with ESMTP id 4CBF4C20; Thu, 19 Apr 2001 16:26:35 -0600 (MDT) Received: from mina.soco.agilent.com (mina.soco.agilent.com [141.121.54.157]) by msgrel1.and.agilent.com (Postfix) with ESMTP id 9EF6647; Thu, 19 Apr 2001 18:26:33 -0400 (EDT) Received: from mina.soco.agilent.com (darrylo@localhost [127.0.0.1]) by mina.soco.agilent.com (8.9.3 (PHNE_22672)/8.9.3 SMKit7.1.1_Agilent) with ESMTP id PAA21832; Thu, 19 Apr 2001 15:26:32 -0700 (PDT) Message-Id: <200104192226.PAA21832@mina.soco.agilent.com> To: Warner Losh Cc: freebsd-small@FreeBSD.ORG Subject: Re: The ultimate board! Reply-To: Darryl Okahata In-Reply-To: Your message of "Thu, 19 Apr 2001 10:58:50 MDT." <200104191658.f3JGwo804947@harmony.village.org> Mime-Version: 1.0 (generated by tm-edit 1.6) Content-Type: text/plain; charset=US-ASCII Date: Thu, 19 Apr 2001 15:26:32 -0700 From: Darryl Okahata Sender: owner-freebsd-small@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Warner Losh wrote: > 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? Still, even if you assume 2 writes a minute (once every 30 seconds???) to the same block, over and over, it's still over two years (1e5 writes -- I'm assuming that you mean "100000" for "10e5", and not "1000000"). [ Of course, if one were to write a new/special filesystem that ensured even wear, that would work well for CF .... ] -- Darryl Okahata darrylo@soco.agilent.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Agilent Technologies, or of the little green men that have been following him all day. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message