From owner-freebsd-fs@FreeBSD.ORG Fri Dec 25 11:03:55 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E6FE91065698 for ; Fri, 25 Dec 2009 11:03:55 +0000 (UTC) (envelope-from solon@pyro.de) Received: from srv23.fsb.echelon.bnd.org (mail.pyro.de [83.137.99.96]) by mx1.freebsd.org (Postfix) with ESMTP id 963678FC12 for ; Fri, 25 Dec 2009 11:03:55 +0000 (UTC) Received: from port-87-193-183-44.static.qsc.de ([87.193.183.44] helo=MORDOR) by srv23.fsb.echelon.bnd.org with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1NO7xX-0006j4-0z; Fri, 25 Dec 2009 12:03:54 +0100 Date: Fri, 25 Dec 2009 12:03:30 +0100 From: Solon Lutz X-Mailer: The Bat! (v3.99.25) Professional Organization: pyro.labs berlin X-Priority: 3 (Normal) Message-ID: <1266543768.20091225120330@pyro.de> To: Thomas Burgess In-Reply-To: References: <568624531.20091215163420@pyro.de> <42952D86-6B4D-49A3-8E4F-7A1A53A954C2@spry.com> <957649379.20091216005253@pyro.de> <26F8D203-A923-47D3-9935-BE4BC6DA09B7@corp.spry.com> <1696529130.20091223212612@pyro.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Score: -1.4 (-) X-Spam-Report: Spam detection software, running on the system "srv23.fsb.echelon.bnd.org", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see The administrator of that system for details. Content preview: Guten Tag Thomas Burgess, Dear Thomas Burgess, am Freitag, 25. Dezember 2009 um 01:46 schrieben Sie: on Freitag, 25. Dezember 2009 at 01:46 you wrote: > On Thu, Dec 24, 2009 at 11:53 AM, Ronald Klop wrote: > Isn't it write caching? > My Solaris machine at work also flushes the data every 30 seconds. [...] Content analysis details: (-1.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.4 ALL_TRUSTED Passed through trusted hosts only via SMTP X-Spam-Flag: NO Cc: freebsd-fs@freebsd.org Subject: Re: ZFS RaidZ2 with 24 drives? X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 Dec 2009 11:03:56 -0000 Guten Tag Thomas Burgess, Dear Thomas Burgess, am Freitag, 25. Dezember 2009 um 01:46 schrieben Sie: on Freitag, 25. Dezember 2009 at 01:46 you wrote: > On Thu, Dec 24, 2009 at 11:53 AM, Ronald Klop wrote: > Isn't it write caching? > My Solaris machine at work also flushes the data every 30 seconds. > Ronald. > I think you are right. ZFS does work in bursts...it's very different than what most people expect. I know it was really weird to me when i first saw it. But my case isn't anywhere near of performance... According to iostat and gstat it reads and writes some data for 3-4 seconds and then sits there silently for another 10 and does absolutely nothing. Even when I'm doing single HD to single HD copy... Best regards, Solon