From owner-freebsd-questions@FreeBSD.ORG Tue May 26 18:45:29 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 019A210656DE for ; Tue, 26 May 2009 18:45:29 +0000 (UTC) (envelope-from Ggatten@waddell.com) Received: from mailhost0.waddell.com (mailhost0.waddell.com [12.154.38.61]) by mx1.freebsd.org (Postfix) with ESMTP id 9CD578FC08 for ; Tue, 26 May 2009 18:45:28 +0000 (UTC) (envelope-from Ggatten@waddell.com) Received: from mailhost2.waddell.com (mailhost2.waddell.com [10.1.10.30]) by mailhost0.waddell.com (8.13.8/8.13.8) with ESMTP id n4QIiqh0005774; Tue, 26 May 2009 13:45:02 -0500 (CDT) (envelope-from Ggatten@waddell.com) Received: from mailhost2.waddell.com (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 756E8B594E; Tue, 26 May 2009 13:44:52 -0500 (CDT) Received: from wadpexf0.waddell.com (wadpexf0.waddell.com [192.168.204.24]) by mailhost2.waddell.com (Postfix) with ESMTP id 5C49EB593F; Tue, 26 May 2009 13:44:52 -0500 (CDT) Received: from WADPEXV0.waddell.com ([192.168.204.25]) by wadpexf0.waddell.com with Microsoft SMTPSVC(6.0.3790.3959); Tue, 26 May 2009 13:44:51 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Tue, 26 May 2009 13:44:51 -0500 Message-ID: <70C0964126D66F458E688618E1CD008A0793ED94@WADPEXV0.waddell.com> In-Reply-To: <4A1C3725.8040509@infracaninophile.co.uk> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: FreeBSD & Software RAID Thread-Index: AcneMX6gTNj1/tbYSNOlgDhbFbdzFgAAEDFg References: <4A1AA3DC.5020300@network-i.net> <200905261238.52979.kirk@strauser.com><70C0964126D66F458E688618E1CD008A0793ED91@WADPEXV0.waddell.com> <4A1C3725.8040509@infracaninophile.co.uk> From: "Gary Gatten" To: "Matthew Seaman" X-OriginalArrivalTime: 26 May 2009 18:44:51.0893 (UTC) FILETIME=[0DDA9650:01C9DE32] Cc: freebsd-questions@freebsd.org Subject: RE: FreeBSD & Software RAID X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2009 18:45:29 -0000 What about with PAE and/or other extension schemes? If it's just memory requirements, can I assume if I don't have a $hit load of storage and billions of files it will work "ok" with 4GB of RAM? I guess I'm just making sure there isn't some bug that only exists on the i386 architecture? -----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Matthew Seaman Sent: Tuesday, May 26, 2009 1:38 PM To: Gary Gatten Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD & Software RAID Gary Gatten wrote: > Why avoid ZFS on x86? Because in order to deal most effectively with disk arrays of 100s or 1000s of GB as are typical nowadays, ZFS requires more than the 4GB of addressable RAM[*] that the i386 arch can provide. You can make ZFS work on i386, but it requires very careful tuning and is not going to work brilliantly well for particularly large or high-throughput filesystems. Cheers, Matthew [*] Technically, it requires more than the typical 2GB of kernel memory that is the default on i386. KVM under 64bit architectures can be *much* bigger than that. --=20 Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW
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