On 06/03/14 18:47, Les Mikesell wrote: > On Tue, Jun 3, 2014 at 7:09 AM, mark <m.roth at 5-cent.us> wrote: >> I had an old server die; we had another, same model, sitting around lightly >> used, so I did what I've done before: swap the RAID card into that, swap the >> drives, even putting them in the same bays as the dead one, and boot. >> >> Nope. 100% of the time, when it hits switching roots, it kernel panics. >> >> Adding rdshell to the kernel line does nothing, I get no grub rdshell. Booting >> from a flash drive into rescue, it finds everything, *perfectly*, and mounts >> it all, including the RAID data drives. >> >> I've rebuilt the initrd, and no joy. >> >> Anyone have an idea? > > Did you try running "grub-install" after your rescue-mode boot and > chroot into /mnt/sysimage? If that doesn't fix it there is probably > something different about the device/naming of the root partition. > Put another drive in, and had all kinds of grief before, right before I left yesterday, it FINALLY came up. After disconnecting the RAID (I may have wiped one of the RAID devices - luckily this is a backup system). I'm guessing the damn thing, every time I changed drives, reenumerated, ignoring my previous settings, and deciding on its own what should should be the first drive. Wonder if the battery needs replacing.... Of course I tried grub-install. At least two tries, after pxebooting to linux rescue (and it would mount everything *perfectly*), I'd see root was /dev/sda... but grub-install announced that sda had no BIOS entry.... mark