From owner-freebsd-stable@FreeBSD.ORG Fri Feb 13 02:49:30 2009 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 95E621065670 for ; Fri, 13 Feb 2009 02:49:30 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from tarsier.delphij.net (delphij-pt.tunnel.tserv2.fmt.ipv6.he.net [IPv6:2001:470:1f03:2c9::2]) by mx1.freebsd.org (Postfix) with ESMTP id 397238FC32 for ; Fri, 13 Feb 2009 02:49:30 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from tarsier.geekcn.org (tarsier.geekcn.org [211.166.10.233]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by tarsier.delphij.net (Postfix) with ESMTPS id 6919228449 for ; Fri, 13 Feb 2009 10:49:29 +0800 (CST) Received: from localhost (tarsier.geekcn.org [211.166.10.233]) by tarsier.geekcn.org (Postfix) with ESMTP id 14780EC6E63; Fri, 13 Feb 2009 10:49:29 +0800 (CST) X-Virus-Scanned: amavisd-new at geekcn.org Received: from tarsier.geekcn.org ([211.166.10.233]) by localhost (mail.geekcn.org [211.166.10.233]) (amavisd-new, port 10024) with ESMTP id 83wkT3P7ClV0; Fri, 13 Feb 2009 10:49:24 +0800 (CST) Received: from charlie.delphij.net (adsl-76-237-33-62.dsl.pltn13.sbcglobal.net [76.237.33.62]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by tarsier.geekcn.org (Postfix) with ESMTPSA id D9D2DEC6945; Fri, 13 Feb 2009 10:49:22 +0800 (CST) DomainKey-Signature: a=rsa-sha1; s=default; d=delphij.net; c=nofws; q=dns; h=message-id:date:from:reply-to:organization:user-agent: mime-version:to:cc:subject:references:in-reply-to: x-enigmail-version:openpgp:content-type:content-transfer-encoding; b=IY1YSstLuAYK9Oc2mOoGUlzuvCjAe2piA1W0zsEb/bcNHFuE7CSxrLSfogwlOemdG X2n20V9XCDo7eNRiUqjEg== Message-ID: <4994DFB0.3060704@delphij.net> Date: Thu, 12 Feb 2009 18:49:20 -0800 From: Xin LI Organization: The FreeBSD Project User-Agent: Thunderbird 2.0.0.19 (X11/20090202) MIME-Version: 1.0 To: Karl Denninger References: <4994CD7B.7040302@denninger.net> <4994D603.2060406@delphij.net> <4994D931.4060508@denninger.net> <4994DACC.1040801@delphij.net> <4994DBC1.2000309@denninger.net> In-Reply-To: <4994DBC1.2000309@denninger.net> X-Enigmail-Version: 0.95.7 OpenPGP: id=18EDEBA0; url=http://www.delphij.net/delphij.asc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: Upgrade from 32-bit to AMD-64? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: d@delphij.net List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Feb 2009 02:49:31 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Karl Denninger wrote: [...] > I guess I need to schedule the 2-3 hours of downtime..... the reason for > this, by the way, is that I have a dbms app on there that is getting too > RAM hungry for its own good (its a Quadcore CPU) and I'm up against the > RAM limit for 32-bit code. The board will support more but 32-bit code > won't; ergo, the only way to get beyond this is to go to 64-bit. Oh wait! One thing you wanted to know is that, some database *can* have different on-disk format for 32-bit and 64-bit binaries. Be sure to have a dump handy. Last time I hit this on a MySQL "upgrade" between two servers, and I end up using its replication functionality. The operation took longer time than I expected at the beginning. My personal suggestion is that you do an experiment on another box (64-bit capable) to make sure that the data would work, this never hurts and avoids surprises (you do want 64-bit compile of your database application since you want to take full advantage of 64-bit OS); also, just like all upgrades, full backup is advised. Cheers, - -- Xin LI http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (FreeBSD) iEYEARECAAYFAkmU37AACgkQi+vbBBjt66BzlwCfUuQuTY8rXnhE/T1K9BNIZ7bi j9sAoJiPJApQrX5Gwd4kfFWoiGfQs44g =0oRk -----END PGP SIGNATURE-----