From owner-freebsd-fs@FreeBSD.ORG Sun Mar 28 13:03:48 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 06E74106564A for ; Sun, 28 Mar 2010 13:03:48 +0000 (UTC) (envelope-from me@lexasoft.ru) Received: from relay.wahome.ru (relay.wahome.ru [95.211.21.141]) by mx1.freebsd.org (Postfix) with ESMTP id BCBB48FC12 for ; Sun, 28 Mar 2010 13:03:47 +0000 (UTC) Received: from mmx.lexasoft.ru (mmx.lexasoft.ru [92.241.160.6]) by relay.wahome.ru (Postfix) with ESMTP id 8F7746B1DF0; Sun, 28 Mar 2010 17:00:55 +0400 (MSD) Received: from [192.168.40.138] (unknown [124.157.205.118]) by mmx.lexasoft.ru (Postfix) with ESMTPSA id 3758028490; Sun, 28 Mar 2010 17:03:43 +0400 (MSD) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Apple Message framework v1077) From: Alexey Tarasov In-Reply-To: Date: Sun, 28 Mar 2010 17:03:38 +0400 Content-Transfer-Encoding: quoted-printable Message-Id: <492FB7C5-1B48-46BA-B63F-E7CBF7A0A195@lexasoft.ru> References: To: Ivan Voras , freebsd-fs@freebsd.org X-Mailer: Apple Mail (2.1077) Cc: Subject: Re: ZFS raidz and 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: Sun, 28 Mar 2010 13:03:48 -0000 According to mailing lists, these drives can't be configured to present = 4k sectors to OS. Emulation jumper only changes first LBA number to 1 to made WinXP start = first partition from 64 sector (63+1). May be fresh firmware update can solve this problem. On 28.03.2010, at 14:44, Ivan Voras wrote: > AFAIK (I don't have actual experience with them) current 4k drives = emulate 512b drives and have a performance penalty in the above = scenario. Because of this emulation, ZFS doesn't know you have a 4k = drive. If you can, try disabling this emulation and make it present to = the operating system as a true 4k drive. Of course, this will make the = data on it unreadable - you will have to reformat it, and the drive will = be unbootable. >=20 > Good luck and report what you find. >=20 > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" -- Alexey Tarasov (\__/)=20 (=3D'.'=3D)=20 E[: | | | | :]=D0=97=20 (")_(")