From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Greaves Subject: Re: questions about softraid limitations Date: Wed, 14 May 2008 11:45:15 +0100 Message-ID: <482AC2BB.5010602@dgreaves.com> References: <002801c8b55a$60e4a360$0404a8c0@dcccs> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <002801c8b55a$60e4a360$0404a8c0@dcccs> Sender: linux-raid-owner@vger.kernel.org To: Janos Haar Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Janos Haar wrote: > Hello list, Neil, Hi Janos > I have worked on a faulty hw raid card data recovery some days before. > The project is already successfully done, but i run into some limitations. Firstly, are you aware that Linux SW raid will not understand disks written by hardware raid. > Than try to build an "old fashion" linear arrays from each disks + 64k > another blockdevice. (for store the superblock) > But the mdadm refused to _build_ the array, because the source scsi > drive is jumpered to readonly. Why? :-) This will not allow md to write superblocks to the disks. > > I try to build the array with --readonly option, but the mdadm still > dont understand what i want. (yes, i know, rtfm...) This will start the array in readonly mode - you've not created an array yet because you haven't written any superblocks... > Its OK, but what about building a readonly raid 5 array for recovery > usage only? :-) That's fine. If they are md raid disks. Yours aren't yet since you haven't written the superblocks. David