From mboxrd@z Thu Jan 1 00:00:00 1970 From: Casey Boone Subject: Re: raidtools to mdadm Date: Wed, 04 Apr 2007 22:26:20 -0500 Message-ID: <46146C5C.8080502@gmail.com> References: <46103C8B.4030001@gmail.com> <46142D1B.2080401@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <46142D1B.2080401@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: Bill Davidsen Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids >> i do not want to actually change any of the contents of these drives, >> just mount very simply as a raid0. the raid was originally created >> using an onboard nvidia raid on the motherboard these drives used to >> be hooked to. my friend thought he could shove them into another >> windows box (that is what he was running on them) and have windows >> recover the raid. all this did was totally destroy the superblock on >> one of the two drives. dmraid now wont see them as a matched pair so >> that is out. the actual data areas of both drives seems to be >> intact, but unless i can get them into raid0 i dont know how i can >> recover the data. it figures he gives me the drives after he makes >> it a notch or two more of a pain :\ >> > I have friends like that too. ;-) > gotta love 'em wish i was getting paid for this one >> >> now before the advent of mdadm i would use /etc/raidtab and have no >> issues setting up the raid device. \ > > I haven't used raidtools for ages, but can't you bring yourself to > using them now? I seem to remember that there was no superblock to be > written in a bad place, which might be an advantage. mdadm has several > versions which write the superblock in various places on the drives, > and you may want "none of the above." > > Alternatively, if these are fairly small, write a tiny program to open > both physical devices, read a chunk from one, then the other, repeat > while writing to something not hosed. at the suggestion of another on the list (thanks neil brown!) i tried modprobing a slew of things related to the disk mapper to no avail, then i gave up using knoppix and tried with a fedora 6 box (after i dd-ed the drives off to a larger drive) and it worked great. i can definitely say that while mdadm is quite foreign territory for me, i love the fact i can specify everything i want to happen on one command line. btw once i actually did get the drives raided it turns out that while the partition table was intact, somehow the partition itself was fubarred enough that i couldnt mount it to save my life. finally just told the guy "you screwed it by trying to recover it, next time bring me the drives the MOMENT you have a problem" Casey