From owner-freebsd-current@FreeBSD.ORG Fri Dec 14 13:25:19 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BA22416A420 for ; Fri, 14 Dec 2007 13:25:19 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (tim.des.no [194.63.250.121]) by mx1.freebsd.org (Postfix) with ESMTP id 78F1F13C455 for ; Fri, 14 Dec 2007 13:25:18 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (localhost [127.0.0.1]) by spam.des.no (Postfix) with ESMTP id 5C3DC20B1; Fri, 14 Dec 2007 14:25:10 +0100 (CET) X-Spam-Tests: AWL X-Spam-Learn: disabled X-Spam-Score: -0.1/3.0 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on tim.des.no Received: from ds4.des.no (des.no [80.203.243.180]) by smtp.des.no (Postfix) with ESMTP id 3D67020AF; Fri, 14 Dec 2007 14:25:10 +0100 (CET) Received: by ds4.des.no (Postfix, from userid 1001) id 0F13D844A7; Fri, 14 Dec 2007 14:25:10 +0100 (CET) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Doug Rabson References: <47606C09.2070209@isc.org> <47609F0A.7010805@clearchain.com> <47609FE3.8040606@barafranca.com> <4760B444.1080604@clearchain.com> <06CAC7FC-DB58-441D-A6E0-76D1D8133393@tamu.edu> <86ir31xwlu.fsf@ds4.des.no> <1197637700.1250.35.camel@herring.rabson.org> Date: Fri, 14 Dec 2007 14:25:10 +0100 In-Reply-To: <1197637700.1250.35.camel@herring.rabson.org> (Doug Rabson's message of "Fri\, 14 Dec 2007 13\:08\:20 +0000") Message-ID: <86abodxvbd.fsf@ds4.des.no> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: David Duchscher , freebsd-current@freebsd.org, Benjamin Close , Hugo Silva Subject: Re: ZFS melting under postgres... X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Dec 2007 13:25:19 -0000 Doug Rabson writes: > Dag-Erling Sm=C3=B8rgrav writes: > > David Duchscher writes: > > > So does anybody know of a battery backed NVRAM card that can be used > > > with FreeBSD that the ZIL could be offloaded to? > > Any CF card or similar will do. You don't need battery backup for > > flash memory. > > THis may also have to wait for a future version of ZFS. I remember > reading about this kind of thing as an upcoming feature in Solaris. I > believe the way this feature would work is that ZFS would allow creating > the ZIL on a different pool to the filesystem - i.e. create a zpool on > the CF card and get the ZIL to live there. AFAIK this is already implemented in ZFS, though I'm not sure Pawel has merged it into FreeBSD yet. Note that you can also get disk drives with a certain amount of NAND flash built-in, but FreeBSD doesn't support that yet. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no