[CentOS] Software RAID complete drives or individual partitions
SilverTip257
silvertip257 at gmail.com
Wed Mar 6 23:38:13 UTC 2013
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
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--
---~~.~~---
Mike
// SilverTip257 //
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