Re: install-mbr on amd64?
On Sat, May 20, 2006 at 02:09:27PM +0200, Alexander Sieck wrote:
> Goswin is right. I have installed etch on amd64 and configured
> RAID1, LVM and grub in d-i.
>
> # BEGIN-CLI
> deb64a:~# df
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/md1 1829101 189101 1542410 11% /
> /dev/md0 60093 19372 37515 35% /boot
> ...
> # END-CLI
>
> After the installation only the MBR on /dev/sda contains meaningful
> data, whereas the MBR on /dev/sdb contains mostly zeros.
True. You have to install grub to both drives, and the installer only
does it to one of them. Easily fixed manually.
> # BEGIN-CLI
> deb64a:~# dd if=/dev/sda bs=512 count=1 | od -v | head -n 12
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 2.2e-05 seconds, 23.3 MB/s
> 0000000 044353 150220 000274 175574 003520 017520 137374 076033
> 0000020 015677 050006 134527 000745 122363 136713 003676 002261
> 0000040 067070 076000 072411 101423 010305 172342 014315 172613
> 0000060 143203 044420 014564 026070 173164 132640 132007 001003
> 0000100 000377 020000 000001 000000 001000 100372 100312 051752
> 0000120 000174 030400 107300 107330 136320 020000 120373 076100
> 0000140 177474 001164 141210 137122 076571 032350 173001 100302
> 0000160 052164 040664 125273 146525 055023 071122 100511 052773
> 0000200 072652 120103 076101 140204 002565 160603 072001 063067
> 0000220 046213 137020 076005 042306 000777 105546 042036 143574
> 0000240 010004 143400 001104 000001 104546 004134 042307 000006
> 0000260 063160 140061 042211 063004 042211 132014 146502 071023
>
> deb64a:~# dd if=/dev/sdb bs=512 count=1 | od -v | head -n 12
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 2.1e-05 seconds, 24.4 MB/s
> 0000000 134372 010000 150216 000274 134260 000000 154216 140216
> 0000020 137373 076000 000277 134406 001000 122363 020752 000006
> 0000040 137000 003676 002070 005565 143203 100420 177376 072407
> 0000060 165763 132026 130002 135401 076000 100262 072212 105401
> 0000100 001114 011715 000352 000174 165400 000376 000000 000000
> 0000120 000000 000000 000000 000000 000000 000000 000000 000000
> 0000140 000000 000000 000000 000000 000000 000000 000000 000000
> 0000160 000000 000000 000000 000000 000000 000000 000000 000000
> 0000200 000000 000000 000000 000000 000000 000000 000000 000000
> 0000220 000000 000000 000000 000000 000000 000000 000000 000000
> 0000240 000000 000000 000000 000000 000000 000000 000000 000000
> 0000260 000000 000000 000000 000000 000000 000000 000000 000000
> # END-CLI
>
> After running 'grub-install' on /dev/sdb, both MBRs, on /dev/sda
> and /dev/sdb, contain the right data.
>
> # BEGIN-CLI
> deb64a:~# grub-install --root-directory=/boot --no-floppy /dev/sdb
> Probing devices to guess BIOS drives. This may take a long time.
> Installation finished. No error reported.
> This is the contents of the device map /boot/boot/grub/device.map.
> Check if this is correct or not. If any of the lines is incorrect,
> fix it and re-run the script `grub-install'.
>
> (hd0) /dev/sda
> (hd1) /dev/sdb
>
> deb64a:~# dd if=/dev/sda bs=512 count=1 | od -v | head -n 12
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 0.000638 seconds, 803 kB/s
> 0000000 044353 150220 000274 175574 003520 017520 137374 076033
> 0000020 015677 050006 134527 000745 122363 136713 003676 002261
> 0000040 067070 076000 072411 101423 010305 172342 014315 172613
> 0000060 143203 044420 014564 026070 173164 132640 132007 001003
> 0000100 000377 020000 000001 000000 001000 100372 100312 051752
> 0000120 000174 030400 107300 107330 136320 020000 120373 076100
> 0000140 177474 001164 141210 137122 076571 032350 173001 100302
> 0000160 052164 040664 125273 146525 055023 071122 100511 052773
> 0000200 072652 120103 076101 140204 002565 160603 072001 063067
> 0000220 046213 137020 076005 042306 000777 105546 042036 143574
> 0000240 010004 143400 001104 000001 104546 004134 042307 000006
> 0000260 063160 140061 042211 063004 042211 132014 146502 071023
> deb64a:~# dd if=/dev/sdb bs=512 count=1 | od -v | head -n 12
> 1+0 records in
> 1+0 records out
> 512 bytes (512 B) copied, 0.013082 seconds, 39.1 kB/s
> 0000000 044353 010220 150216 000274 134260 000000 154216 140216
> 0000020 137373 076000 000277 134406 001000 122363 020752 000006
> 0000040 137000 003676 002070 005565 143203 100420 177376 072407
> 0000060 165763 132026 130002 135401 076000 100262 072212 001003
> 0000100 000201 020000 000001 000000 001000 110372 173220 100302
> 0000120 001165 100262 054752 000174 030400 107300 107330 136320
> 0000140 020000 120373 076100 177474 001164 141210 137122 076577
> 0000160 032350 173001 100302 052164 040664 125273 146525 055023
> 0000200 071122 100511 052773 072652 120103 076101 140204 002565
> 0000220 160603 072001 063067 046213 137020 076005 042306 000777
> 0000240 105546 042036 143574 010004 143400 001104 000001 104546
> 0000260 004134 042307 000006 063160 140061 042211 063004 042211
> # END-CLI
>
> I did not unplug or replugged the HDs, but I changed the
> HD boot order in the BIOS, from IDE-channel2, -channel3 to
> IDE-channel3, -channel2, and can boot in both cases.
>
> I think this prooves that grub does not work out of the box
> with RAID1 as many might expect, but that it is quite easy
> to enable booting from both HDs.
Well actually grub works, then debian installer doesn't.
> Even if the MBR is missing on the 2nd drive and the
> 1st drive crashes, one can still install the MBR on the
> 2nd drive with a rescue CD.
Len Sorensen
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