Ok; I'll do all these steps, but before I have a comment:
If I let start the PC with my hard disk (GRUB2) I can insmod lvm, set
root device to the /boot logical volume on 4KB-sector disk and load the
GRUB config file. Linux kernel runs and the system on this 4TB USB disk
starts... But if I set root to this disk (hd1) and chainload the boot
sector (+1) again it hangs the same way as booting directly to this 4TB
drive.
On 20/03/16 00:35, Andrei Borzenkov wrote:
20.03.2016 07:55, Emilio Lazo Zaia пишет:
Hello Andrei.
Yes to all your questions!
I'm using this 4TB disk on my desktop PC and even on the laptop but booting
with another media. Both are BIOS.
OK, so to make sure we have common ground.
Fetch 2.02~beta3 from http://alpha.gnu.org/gnu/grub
Compile it using
./configure
make
Make sure you have mtools and xorriso (could be part of libburnia-tools
or similar) installed
Create rescue image that can be used to boot off CD/USB
pkgdatadir=$PWD ./grub-mkrescue -d grub-core -o /tmp/grub.iso
This creates ISO image suitable for both CD and HDD boot. If using USB
stick, just dd this image on full stick. When booting from it, you will
end in GRUB command prompt.
Check what
ls -l
in GRUB CLI says. What sector size GRUB detects for your disk? Does GRUB
see partitions on your disk? Do they look reasonable (size, offset)? If
yes, try
insmod lvm
ls -l
again. Does GRUB detect LVs?
Do you have serial port (RS-2323) on your system and another system that
can be used to connect to serial port? This would make capturing output
much easier.
El mar 20, 2016 12:05 a.m., "Andrei Borzenkov" <[email protected]>
escribió:
20.03.2016 02:18, Emilio Lazo Zaia пишет:
Hello
I'm trying to boot off an WD MyBook 4TB disk (WDC WD40EZRX-00SPEB0) with
GRUB2. The disk has the following partition schema:
------
GPT fdisk (gdisk) version 1.0.1
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): p
Disk /dev/sdf: 976746240 sectors, 3.6 TiB
Logical sector size: 4096 bytes
Disk identifier (GUID): 117CB10C-C241-460D-AC03-A4F084CFA317
Partition table holds up to 128 entries
First usable sector is 6, last usable sector is 976746234
Partitions will be aligned on 8-sector boundaries
Total free space is 2 sectors (8.0 KiB)
Number Start (sector) End (sector) Size Code Name
1 8 255 992.0 KiB EF02 BIOS boot
partition
2 256 976746234 3.6 TiB 8E00 Linux LVM
------
/boot partition is a logical volume within gpt2 partition. Partition 1
has "legacy boot" flag. Except the 4KB sector size there is nothing
strange.
After grub-install the disk boots under kvm with
$ kvm -snapshot -hda /dev/sdf
But in a non virtualized environment it hangs after selecting boot
device from BIOS boot menu on the laptop (Acer AO722). There is no text,
only the text cursor.
I've installed lilo and it hangs after "L" and extlinux shows "Multiple
active partitions" but there is no active partitions on the protective
MBR and only GPT partition 1 is "legacy boot bootable".
The problem is related to the physical sector size?
That is quite possible. So far I have not heard of BIOS capable of
booting from 4Kn disks and even simply accessing such disks (when
booting from other media) did not work in cases known to me.
Are you willing to help in debugging it? Do you have possibility to boot
from other, more traditional, media, like CD/DVD or USB stick? Can you
compile GRUB with additional debug print enabled?
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