From owner-freebsd-arm@freebsd.org Tue Mar 22 07:22:51 2016 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C6A3FAD8C79 for ; Tue, 22 Mar 2016 07:22:51 +0000 (UTC) (envelope-from erichsfreebsdlist@alogt.com) Received: from alogt.com (alogt.com [69.36.191.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A7FF087F for ; Tue, 22 Mar 2016 07:22:51 +0000 (UTC) (envelope-from erichsfreebsdlist@alogt.com) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=alogt.com; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Subject:Cc:To:From:Date; bh=Xa1/+HwCZ8hzRC1Fu/PuDhu6a02hSvCgelYgB26SpJY=; b=p9GcdKDRJwyWbal/sJh3NDN1QA 2CrgIv+z7O5bijGeFVwhlcOccEAGyQlUiTQaogKooXKa2tdHxJd6jBXyYPn7m03vPF7Y/ixQYaxMF 2lhXgAF0OVIwXP6O5wZKuSE9hShMZ0PbzfPjBH2JkbS16Xt+1PZmJQSgemRRmow3Wdus=; Received: from [114.124.39.27] (port=39866 helo=X220.alogt.com) by sl-508-2.slc.westdc.net with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86_1) (envelope-from ) id 1aiGeP-004MBs-PI; Tue, 22 Mar 2016 01:22:50 -0600 Date: Tue, 22 Mar 2016 15:22:45 +0800 From: Erich Dollansky To: Russell Haley Cc: Warner Losh , freebsd-arm Subject: Re: Effect of partitioning on wear-leveling Message-ID: <20160322152245.623de990@X220.alogt.com> In-Reply-To: References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> <1973487B-0AA7-468D-A9CC-319FBE2122F0@netgate.com> <20160322033417.GD83908@www.zefox.net> <271EF73A-077C-44A5-8B58-721405800B9F@bsdimp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sl-508-2.slc.westdc.net X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - alogt.com X-Get-Message-Sender-Via: sl-508-2.slc.westdc.net: authenticated_id: erichsfreebsdlist@alogt.com X-Authenticated-Sender: sl-508-2.slc.westdc.net: erichsfreebsdlist@alogt.com X-Source: X-Source-Args: X-Source-Dir: X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Mar 2016 07:22:51 -0000 Hi, On Mon, 21 Mar 2016 21:39:37 -0700 Russell Haley wrote: > How long can nand go without power before it starts to lose data > integrity? as said, the manufacturers say 10 years. But those 10 years start with the writing of the data. As we do not know when the internal controller does the writing when moving data in the background, we only can assume a minimal 10 years since the purchase of the device. Erich