From owner-freebsd-stable@FreeBSD.ORG Wed Jan 27 20:26:04 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 875DF106568D for ; Wed, 27 Jan 2010 20:26:04 +0000 (UTC) (envelope-from sty@blosphere.net) Received: from mail-px0-f183.google.com (mail-px0-f183.google.com [209.85.216.183]) by mx1.freebsd.org (Postfix) with ESMTP id 693058FC20 for ; Wed, 27 Jan 2010 20:26:03 +0000 (UTC) Received: by pxi13 with SMTP id 13so4270746pxi.3 for ; Wed, 27 Jan 2010 12:26:03 -0800 (PST) MIME-Version: 1.0 Sender: sty@blosphere.net Received: by 10.114.187.16 with SMTP id k16mr6843861waf.112.1264623962633; Wed, 27 Jan 2010 12:26:02 -0800 (PST) In-Reply-To: <4B6022C6.1090608@andric.com> References: <4B6022C6.1090608@andric.com> Date: Thu, 28 Jan 2010 05:26:00 +0900 X-Google-Sender-Auth: b7e6c77ac2640a91 Message-ID: From: =?UTF-8?B?VG9tbWkgTMOkdHRp?= To: FreeBSD-STABLE Mailing List Content-Type: text/plain; charset=UTF-8 Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Jan 2010 20:26:04 -0000 Seems that the performance is indeed atrocious. I recently (like 2 days ago) had to rescue my zfs pool under opensolaris to spare disks. The performance under OpenSol was what I was expecting, 70MB/s reading and writing at the same time. Now that I'm restoring the stuff back under FreeBSD 8.0-p2 it seems that first the array reads from the source disk and then stops reading and decides to empty the buffer to the destination. There's usually a 2 second pause and after that it goes back to reading. There seems to be something really wrong with this, fbsd zfs implementation seems to be unable to move data between 2 zfs pools writing and reading simultaneously... I think I'll just boot back to opensol and do the transfers there. -- br, Tommi