From owner-freebsd-fs@FreeBSD.ORG Mon Jul 12 12:25:03 2010 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 55A00106566C for ; Mon, 12 Jul 2010 12:25:03 +0000 (UTC) (envelope-from zw_uk@hotmail.com) Received: from bay0-omc4-s17.bay0.hotmail.com (bay0-omc4-s17.bay0.hotmail.com [65.54.190.219]) by mx1.freebsd.org (Postfix) with ESMTP id 4381D8FC08 for ; Mon, 12 Jul 2010 12:25:02 +0000 (UTC) Received: from BAY150-W17 ([65.54.190.199]) by bay0-omc4-s17.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 12 Jul 2010 05:25:02 -0700 Message-ID: X-Originating-IP: [81.5.176.176] From: S M To: Date: Mon, 12 Jul 2010 12:25:02 +0000 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 12 Jul 2010 12:25:02.0468 (UTC) FILETIME=[407D4C40:01CB21BD] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: zfs on 4k sector disks 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: Mon, 12 Jul 2010 12:25:03 -0000 I found that playing with either: (sysctl) vfs.zfs.txg.write_limit_override or (boot/loader.conf) vfs.zfs.txg.timeout=3D5 (boot/loader.conf) vfs.zfs.txg.synctime=3D5 Helped with the write problem. What seems to happen is that zfs' calculatio= ns go slightly wrong if you have a lot of RAM and therefore zfs buffers too= much=2C forcing so many writes that you lose all read IO for a few seconds= .... =20 _________________________________________________________________ http://clk.atdmt.com/UKM/go/197222280/direct/01/ Do you have a story that started on Hotmail? Tell us now=