Entering those commands exactly worked, but I'm not sure why it worked. So, it's progress. I need to find some good reference on GRUB, which seems difficult because most things I can find are about GRUB2, and CentOS has 0.97 On Sat, 18 Sep 2010 17:42:59 +0200 Timo Schoeler <timo.schoeler at riscworks.net> wrote: > On 09/18/2010 05:13 PM, Matthew Topper wrote: > > I'm playing with software RAID and LVM in some virtual machines and > > I've run into an issue that I can't find a good answer to in the > > docs. > > > > I have the following RAID setup: > > > > md0: sda1 and sdb1, RAID 1. This is /boot > > > > md1: sda2 and sdb2, RAID 1. This is a PV for LVM. > > > > VolGroup00, this is the volume group and md1 is the only PV in it. > > > > LogVol00 is swap > > LogVol01 is / > > LogVol02 is /home > > > > So, I tested to see what happens if I disable sdb in virtualbox. > > Machine booted find and I was able to see that part of the raid > > array was gone. > > > > I reattached the disk and rebuilt the array > > mdam --add /dev/md0 /dev/sdb1 > > mdam --add /dev/md1 /dev/sdb2 > > > > The array rebuilt without issue. But now, if I remove sda, the > > machine doesn't boot and grub complains. The question I have is > > how does one reinstall the boot sector at this point? I'm a little > > confused as far as to what device to install it on and what to > > specify as the root. > > > > This is grub.conf if it helps: > > > > default=0 > > timeout=5 > > splashimage=(hd0,0)/grub/splash.xpm.gz > > title CentOS (2.6.18-194.e15) > > root (hd0,0) > > kernel /vmlinuz-2.6.18-194.e15 ro > > root=/dev/VolGroup00/LogVol01 initrd /initrd-2.6.18-194.e15.img > > > > Grub has always been a little confusing for me, so I guess I don't > > understand. What do the two root entries specify? And again, my > > main question is how do I reinstall grub to the repaired disk? > > Sorry for the lengthy post, I'm trying to provide as much > > information as possible. > > http://wiki.centos.org/HowTos/CentOS5ConvertToRAID#head-fa2b73a28acdf965daa1e018962eaa8cbd94110c > > HTH, > > Timo :) > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos