hi!
I got a problem with one of my servers where the boot process fails,
because it cannot find its root partition.
My /boot/grub/grub.conf uses to look like
---8<---
title CentOS (2.6.32-431.17.1.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-431.17.1.el6.x86_64 ro root=UUID=8ef1f6cb-5dfc-497e-83d0-8d91cbbe4939 rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto rd_NO_DM rd_NO_LVM KEYBOARDTYPE=pc KEYTABLE=de
initrd /initramfs-2.6.32-431.17.1.el6.x86_64.img
---8<--
I could get the system to boot again by just replacing the
"root=UUID-..." part with "root=/dev/sdb3"
when I started looking around, I noticed that the "/dev/disk"by-uuid"
directory was not there. The "by-id" as well as the "by-path"
directories were both there. I tried to create directory and the links
in the directory manually, but they were gone after the next reboot.
I assume that these /dev/disk/ entries are created by some process at
boot time, but I have no clue how this is done nor what is wrong with
my system.
I checked what blkid -L says, but this seems to be OK.
---8<---
device fs_type label mount point UUID
-----------------------------------------------------------------------------------------
/dev/sda1 ext4 /mnt/raid a574f30b-fa43-4e34-8498-1cb29c4c261f
/dev/sdb1 ext4 /boot 01746f38-6289-4b03-8011-bfac89ed89bd
/dev/sdb2 swap <swap> 903a51b7-393d-4df9-9b58-f06a0a80a748
/dev/sdb3 ext4 / 8ef1f6cb-5dfc-497e-83d0-8d91cbbe4939
---8<---
Any help?
btw., the problem appeared when I installed a 18TB raid array. I had
to compile the e2fsprogs from the most recent sources using this
recipe
http://blog.ronnyegner-consulting.de/2011/08/18/ext4-and-the-16-tb-limit-now-solved
to install a very large ext4 file system on the raid disk.
best regards
---
Michael Schumacher
PAMAS Partikelmess- und Analysesysteme GmbH
Dieselstr.10, D-71277 Rutesheim
Tel +49-7152-99630
Fax +49-7152-996333
Geschäftsführer: Gerhard Schreck
Handelsregister B Stuttgart HRB 252024