From owner-freebsd-stable@FreeBSD.ORG Thu Sep 11 16:36:30 2014 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DB2DED56 for ; Thu, 11 Sep 2014 16:36:30 +0000 (UTC) Received: from cu01176b.smtpx.saremail.com (cu01176b.smtpx.saremail.com [195.16.151.151]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 94E863CD for ; Thu, 11 Sep 2014 16:36:30 +0000 (UTC) Received: from [172.16.2.2] (izaro.sarenet.es [192.148.167.11]) by proxypop04.sare.net (Postfix) with ESMTPSA id CA3599DD03E; Thu, 11 Sep 2014 18:28:44 +0200 (CEST) Subject: Re: getting to 4K disk blocks in ZFS Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset="utf8"; X-Pgp-Agent: GPGMail (null) From: Borja Marcos In-Reply-To: <54114217.9040403@denninger.net> Date: Thu, 11 Sep 2014 18:28:36 +0200 Content-Transfer-Encoding: 8bit Message-Id: <68A42E6F-A089-4A3C-A394-C73162B86308@sarenet.es> References: <540FF3C4.6010305@ish.com.au> <54100258.2000505@freebsd.org> <5410F0B4.9040808@ish.com.au> <54114029.3060507@FreeBSD.org> <54114217.9040403@denninger.net> To: Karl Denninger X-Mailer: Apple Mail (2.1283) Cc: freebsd-stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Sep 2014 16:36:30 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sep 11, 2014, at 8:32 AM, Karl Denninger wrote: It works great until you start replacing older disks with new, larger ones and find out that the new ones are 4k where the old ones were not..... Yes, I agree. The problem is, it can become a time bomb especially for small, modest installations. You build a small server (and maybe you don't have the resources for a full migration readily available) and, one day, two years in the future, one of the disks breaks. You buy a new one, replace, and your performance gets worse. Or, anyway, the timebombs are already in place. As far as I know most new disks sold nowadays are "advanced format". Borja. -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEUEARECAAYFAlQRzbsACgkQULpVo4XWgJ+8RwCfeYowXbeKzs1W2j1ClOux+6wo W5gAl2okA16O2Z9YK8Z/ufwKT1hYpqw= =an3n -----END PGP SIGNATURE-----