From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: In this partition scheme, grub does not find md information? Date: Tue, 29 Jan 2008 19:57:01 +0300 Message-ID: <479F5ADD.7080907@msgid.tls.msk.ru> References: <479EAF42.6010604@pobox.com> <18334.46306.611615.493031@notabene.brown> <479F07E1.7060408@pobox.com> <479F0AAB.3090702@rabbit.us> <479F331F.7080902@msgid.tls.msk.ru> <479F3C74.1050605@rabbit.us> <479F4CFC.5060305@pobox.com> <20080129163728.GB16250@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20080129163728.GB16250@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= Cc: Moshe Yudkowsky , Peter Rabbitson , linux-raid@vger.kernel.org List-Id: linux-raid.ids Keld J=F8rn Simonsen wrote: > On Tue, Jan 29, 2008 at 09:57:48AM -0600, Moshe Yudkowsky wrote: >> In my 4 drive system, I'm clearly not getting 1+0's ability to use g= rub=20 >> out of the RAID10. I expect it's because I used 1.2 superblocks (wh= y=20 >> not use the latest, I said, foolishly...) and therefore the RAID10 -= -=20 >> with even number of drives -- can't be read by grub. If you'd patch = that=20 >> information into the man pages that'd be very useful indeed. >=20 > If you have 4 drives, I think the right thing is to use a raid1 with = 4 > drives, for your /boot partition. Then yo can survive that 3 disks > crash! By the way, on all our systems I use small (256Mb for small-software sy= stems, sometimes 512M, but 1G should be sufficient) partition for a root files= ystem (/etc, /bin, /sbin, /lib, and /boot), and put it on a raid1 on all (usu= ally identical) drives - be it 4 or 6 or more of them. Root filesystem does= not change often, or at least it's write speed isn't that important. But d= oing this way, you always have all the tools necessary to repair a damaged s= ystem even in case your raid didn't start, or you forgot where your root disk= is etc etc. But in this setup, /usr, /home, /var and so on should be separate parti= tions. Also, placing /dev on a tmpfs helps alot to minimize number of writes necessary for root fs. /mjt - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html