From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Port Multiplier access with Sil 3124 Date: Mon, 09 Feb 2009 22:48:45 -0500 Message-ID: <4990F91D.4020503@garzik.org> References: <498F42B6.8030607@tlinx.org> <87f94c370902090635h2fc3e604n990bdd70be9c48cd@mail.gmail.com> <4990AC91.8010104@tlinx.org> <87f94c370902091501h96ecb8dp7acac1fa80a82d8a@mail.gmail.com> <4990C70E.1010707@garzik.org> <4990D349.4050408@tlinx.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:55619 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752888AbZBJDsu (ORCPT ); Mon, 9 Feb 2009 22:48:50 -0500 In-Reply-To: <4990D349.4050408@tlinx.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Linda Walsh Cc: linux-ide@vger.kernel.org Linda Walsh wrote: > Jeff Garzik wrote: >> Greg Freemyer wrote: >> >>> I'm hearing of people saying a 2 disk mirror (raid-1) is not safe >>> enough. Go with either a 3 disk mirror or to raid-6. Even with >>> raid-6 I personally would not let it have too many spindles. (Whatever >>> too many means?) >> >> IMO, RAID-1 was never safe. With RAID-1, one must rely solely on >> "knowing" which RAID component is bad. With a completely dead drive, >> this is obvious; with slowly creeping bad sectors, far less obvious. > --- > I had a similar thought -- how would I know if the > 2-disks are actually "in sync"? > > I'm guessing I could physically remove each and try to access > them as single-drives and they should be the same, but I don't know that > the RAID-1 format will store the data on each drive to exactly look > like a single mounted disk. I can't think of how else they might > do it, or why, but I just haven't physically verified that I an > pull either HD and access it as a solo-hard disk. (I'd hope so...but > until I've actually tried it with the hardware in question...) > > But all of this is really depressing me. Just throw up my hands > and give up on computer storage? Find a solution that has both replication and checksumming :) Trust no component! :) Jeff