On Wed, Mar 6, 2013 at 2:12 PM, Gordon Messmer <yinyang at eburg.com> wrote: > On 03/05/2013 05:58 AM, SilverTip257 wrote: > > > > Veering slightly from your original question... > > I recently set up softraid arrays by hand before invoking the Anaconda > > installer (on a 6.3 install). Recent mdadm packages that ship with > CentOS > > support metadata 1.1 and 1.2 (... actually defaulting to 1.2 I believe), > > but GRUB 0.97 only supports metadata 1.0 and not the metadata version > that > > mdadm defaulted to. On my CentOS 5 installs in the past I've > specifically > > set --metadata=0.90 to avert any catastrophes like this. > > As far as I know, GRUB 0.97 only supports metadata 0.90, as does LILO. > Anaconda will create arrays with 0.90 metadata for this reason. > I can tell you from my recent experience that whatever concoction of GRUB 0.97 (shipped with CentOS 6.3) supports booting off of metadata 1.0 I often encounter metadata 0.90 ... on many [all?] of the aging CentOS 5 installs I see. > > The kernel wiki disagrees with me: > https://raid.wiki.kernel.org/index.php/RAID_superblock_formats > > Debian's documentation indicates that only grub 1.98+20100720-1 or later > will boot from a RAID volume with a newer metadata format: > Grub 1.99 or thereabouts is pretty awesome. Grub2 (as Debian packages it) supports booting off LVM which is slick. Not overly useful, but convenient if you would rather /boot be part of the rootfs ... especially with kernels getting larger. A /boot partition that could be 100MB with CentOS 5 now needs to be around 512MB with CentOS 6 (found this out the hard way with a development system). Disk space is cheap ... but I still don't want to waste space! :) > > http://www.debian.org/releases/stable/i386/release-notes/ch-information.en.html#mdadm-metadata > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- ---~~.~~--- Mike // SilverTip257 //