Hello, I've tried many combinations of a fresh Debian 8 installation on a computer with «Intel Pentium MMX» at 200MHz processor. Debian CD boots and DebianInstaller performs all processes without any problem, including the GRUB bootloader install (all cases at /dev/sda) GRUB only boots installed system when operating system's root is at first partition of first hard disk.
GRUB (v2.02~beta2-22+deb8u1) fails to read on boot ANY filesystem if target OS has root volume at other place than (hd0,msdos1) (= /dev/sda1). CASE 1: Single drive /dev/sda1 primary for all space (32GiB) Ext4 mounted on / Succeeds: boots operating system. CASE 2: Single drive /dev/sda1 primary for 1GB Ext4 mounted on /boot /dev/sda2 primary for 10GB Ext4 mounted on / error: unknown filesystem. Entering rescue mode... grub rescue> ls (hd0) (hd0,msdos1) (hd0,msdos2) (fd0) grub rescue> ls (hd0,msdos1)/ (hd0,msdos1): Filesystem is unknown. CASE 3: Three hard disks /dev/sda1 primary for 10GB Ext4 mounted on / /dev/sdb blank /dev/sdc blank Succeeds: boots operating system. CASE 4: Three hard disks /dev/sda1 primary for 1GB Ext4 mounted on /boot /dev/sda2 primary for 10GB Ext4 mounted on / /dev/sdb blank /dev/sdc blank error: unknown filesystem. Entering rescue mode... grub rescue> ls (hd0) (hd0,msdos1) (hd0,msdos2) (hd1) (hd2) (fd0) grub rescue> ls (hd0,msdos1)/ (hd0,msdos1): Filesystem is unknown. CASE 5: Three hard disks /dev/sda1 primary for all space (32GiB) volume for RAID /dev/sdb1 primary for all space (32GiB) volume for RAID /dev/sdc1 primary for all space (32GiB) volume for RAID /dev/md0 for all space (100GB) Ext4 mounted on / error: disk `mduuid/a867853f5e9773488fa4911285e2db93´ not found. Entering rescue mode... grub rescue> ls (hd0) (hd0,msdos1) (hd1) (hd1,msdos1) (hd2) (hd2,msdos1) (fd0) grub rescue> ls (hd0,msdos1)/ (hd0,msdos1): Filesystem is unknown. CASE 6: Three hard disks /dev/sda1 primary for 1GiB Ext 4 mounted on /boot /dev/sda2 primary for 31GiB volume for RAID /dev/sdb1 primary for 1GiB unused /dev/sdb2 primary for 31GiB volume for RAID /dev/sdc1 primary for 1GiB unused /dev/sdc2 primary for 31GiB volume for RAID /dev/md0 for all RAID space (~100GB) Ext4 mounted on / error: unknown filesystem. error: disk `mduuid/a867853f5e9773488fa4911285e2db93´ not found. Entering rescue mode... grub rescue> ls (hd0) (hd0,msdos1) (hd0,msdos2) (hd1) (hd1,msdos1) (hd1,msdos2) (hd2) (hd2,msdos1) (hd2,msdos2) (fd0) grub rescue> ls (hd0,msdos1)/ (hd0,msdos1): Filesystem is unknown. CASE 7: Three hard disks /dev/sda1 primary for 10GB Ext4 mounted on /boot /dev/sdb1 primary for 10GB volume for RAID /dev/sdc1 primary 10GB volume for RAID /dev/md0 for all space (20GB) Ext4 mounted on / error: unknown filesystem. Entering rescue mode... grub rescue> _ CASE 8: Three hard disks /dev/sda1 primary for 10GB Ext4 mounted on / /dev/sdb1 primary for 10GB volume for RAID /dev/sdc1 primary 10GB volume for RAID /dev/md0 for all space (20GB) Ext4 mounted on /home Succeeds: boots operating system. OTHER OPERATIONS: - Tried with Ext3 filesystem with same results. - Tried a Live-boot to chroot and perform "update-grub" + "grub-install /dev/sda". Commands succeeded with no errors. - Filesystem & contents are consistent in all cases. _______________________________________________ Bug-grub mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-grub
