[CentOS] RAID 1 not boot when disconnect a disk

Roberto Pereyra pereyra.roberto at gmail.com
Tue Nov 28 10:44:39 UTC 2006

Thanks to all for the help, looks like a bios bug.

Thanks again !!


2006/11/27, Kevan Benson <kbenson at a-1networks.com>:
> On Friday 24 November 2006 20:06, Aleksandar Milivojevic wrote:
> > Kevan Benson wrote:
> > > Unless it's new in 4.4, that's not the case.  Grub can't undertand the md
> > > devices, and has to be installed on the disk geometry individually, as
> > > your link suggests, which anaconda doesn't do.  I hear RHEL 5 fixes this
> > > though.
> >
> > Installing Grub into first partition is definitely the way its done in
> > CentOS 4.4, if /boot is on RAID-1 md device.  Not sure if it is
> > something new (I haven't noticed it before either).  Actually, even if
> > you attempt to force installation of Grub into MBR (for example in
> > ks.cfg), Anaconda is going to ignore it and install into partition (of
> > course, only if /boot is on RAID-1 md device).  I've noticed this when
> > installing on some used drives that had LILO in MBR.  After
> > installation, the machine wouldn't boot.  BIOS was loading LILO from
> > previous installation (which was in MBR), instead of Grub from current
> > installation (which was in bootable partition).
> Ah, so anaconda installs onto the first partition of each drive when boot is
> software RAID-1?  That would explain much of what I saw.  I usually
> enountered this on machines that previouslyt had lilo installed (as you did).
> It also explains why anaconda didn't error.
> > BTW, while I'm mentioning it, does anybody know a good way (or tool) to
> > evict (clear, zero-out) boot loader from MBR?  Preserving partition
> > table of course.
> Looks like lilo -u can do it, but that's not much help unless oyu have it
> installed (and I'm not sure whether or not it requires a saved copy of the
> MBR from beforehand).  The windows fdisk (as mentioned elsewhere in this
> thread) can do it, but it might just be easier to install grub on to each
> drive's MBR.
> --
> - Kevan Benson
> - A-1 Networks
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Ing. Roberto Pereyra
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