From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 2 May 2002 15:21:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 2 May 2002 15:21:50 -0400 Received: from [195.63.194.11] ([195.63.194.11]:2576 "EHLO mail.stock-world.de") by vger.kernel.org with ESMTP id ; Thu, 2 May 2002 15:21:49 -0400 Message-ID: <3CD18318.7060407@evision-ventures.com> Date: Thu, 02 May 2002 20:19:04 +0200 From: Martin Dalecki User-Agent: Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.0rc1) Gecko/20020419 X-Accept-Language: en-us, pl MIME-Version: 1.0 To: Pavel Machek CC: Roy Sigurd Karlsbakk , linux-kernel@vger.kernel.org Subject: Re: IDE hotplug support? In-Reply-To: <20020426152943.A413@toy.ucw.cz> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Uz.ytkownik Pavel Machek napisa?: > Hi! > > >>I came across a nice case from procase, supporting 16 IDE drives in >>(so-called?) hotplug frames. Problem is... How will linux trat this? > > > Should be okay. Hdparm can force spindown and bus rescan, and that's > basically what you need. > > >>I plan to use 15 drives in a RAID-5, assigning the last 16th drive as a >>spare. > > > 8 controllers? hmmm... 15 drives == 16 interfaces == 8 channels == 4 controllers with primary and secondary channel. He will have groups of about 4 drives on each channel wich serialize each other due to excessive IRQ line sharing and master slave issues. 8 x 130MBy/s >>>> PCI bus throughput... I would rather recommend a classical RAID controller card for this kind of setup. The request aliasing effects will be almost for sure disasterous to overall system performance.