From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id i3MLCtp24922 for ; Thu, 22 Apr 2004 17:12:55 -0400 Received: from solwarra.gbrmpa.gov.au (solwarra.gbrmpa.gov.au [146.116.1.5]) by mx1.redhat.com (8.12.10/8.12.10) with ESMTP id i3MLCrKG009262 for ; Thu, 22 Apr 2004 17:12:54 -0400 Received: from gbrmpa.gov.au (pandemonium.gbrmpa.gov.au [146.116.2.0]) by solwarra.gbrmpa.gov.au (8.11.6+Sun/8.10.2) with ESMTP id i3ML7bK06658 for ; Fri, 23 Apr 2004 07:07:37 +1000 (EST) Message-ID: <4088354D.3080503@gbrmpa.gov.au> Date: Fri, 23 Apr 2004 07:12:45 +1000 From: Glen Harris MIME-Version: 1.0 Subject: Re: [linux-lvm] About Extending LVM size with Hardware Raid References: <01285A15-9419-11D8-B982-000A95730E92@spamaps.org> <40875353.8020104@gbrmpa.gov.au> <1082652373.9271.29.camel@arthur.cbd.careercast.com> In-Reply-To: <1082652373.9271.29.camel@arthur.cbd.careercast.com> Content-Transfer-Encoding: 7bit Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Clint Byrum wrote: > Side Note: if anyone knows of a cheap way to hotswap PATA disks, I'd > like to hear about it. Right now I stick 'em in a crappy old box with > those $2 removable IDE tray things, and have to reboot that box whenever > I'm done copying stuff to the disks. No big deal, but it seems kinda > cheesy. :-P PATA disks are difficult. There is a very slight chance of damaging the interface electronics, and motor driver electronics. There is also a chance of data loss, as it is difficult to guarantee that no write- behind cache is in operation. Finally, the operating system has to be able to disable an IDE device and redetect it, including partition tables, etc - somewhat of a grey area in the Linux kernel from my reading of the kernel sources. If that's changed, please let me know! There are cheap($30) hotswap caddies with a power switch which removes power from the drive and places the interface bus in Hi-Z state, but this still leaves the caching and operating system disable/redetect issues. Cheers, glen.