3:20 p.m.
I have a F16 system (which had been upgraded from F15) that is running
RAID-1 for all volumes. I have notice that GRUB2 is only on /dev/sda but
not on /dev/sdb
[root@wisdom boot]# file - < /dev/sda
/dev/stdin: x86 boot sector; partition 1: ID=0xfd, active, starthead 32,
startsector 2048, 785137 sectors; partition 2: ID=0xfd, starthead 0,
startsector 787185, 15631245 sectors; partition 3: ID=0xfd, starthead 0,
startsector 16418430, 8000370 sectors; partition 4: ID=0x5, starthead 254,
startsector 24418800, 1929101265 sectors, code offset 0x63
[root@wisdom boot]# file - < /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3,
boot drive 0x80, 1st sector stage2 0x842a9; partition 1: ID=0xfd, active,
starthead 32, startsector 2048, 785137 sectors; partition 2: ID=0xfd,
starthead 0, startsector 787185, 15631245 sectors; partition 3: ID=0xfd,
starthead 0, startsector 16418430, 8000370 sectors; partition 4: ID=0x5,
starthead 254, startsector 24418800, 1929101265 sectors, code offset 0x63
My concern is if I were to loose /dev/sda I want to be able to boot via
/dev/sdb.
I have tried running:
[root@wisdom boot]# grub2-install /dev/sdb --no-floppy
Installation finished. No error reported.
but there is no change in what file reports.
Both disks are identical (same model) and the partition table was
duplicated with "sfdisk -d /dev/sda | sfdisk /dev/sdb"
Or am I reading the output from file wrong and its actually /dev/sda that
doesn't have grub2 installed on it?
Thanks, Jeff
3:34 p.m.
On 05/02/2012 01:20 PM, Jeffrey Ross wrote:
[root@wisdom boot]# file -< /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3,
boot drive 0x80, 1st sector stage2 0x842a9; partition 1: ID=0xfd, active,
starthead 32, startsector 2048, 785137 sectors; partition 2: ID=0xfd,
starthead 0, startsector 787185, 15631245 sectors; partition 3: ID=0xfd,
starthead 0, startsector 16418430, 8000370 sectors; partition 4: ID=0x5,
starthead 254, startsector 24418800, 1929101265 sectors, code offset 0x63
Or am I reading the output from file wrong and its actually /dev/sda that
doesn't have grub2 installed on it?
Yup! That's exactly what you're doing, as the snippet above shows.
3:36 p.m.
Am 02.05.2012 22:20, schrieb Jeffrey Ross:
I have a F16 system (which had been upgraded from F15) that is
running
RAID-1 for all volumes. I have notice that GRUB2 is only on /dev/sda but
not on /dev/sdb
where do you read this?
[root@wisdom boot]# file - < /dev/sda
/dev/stdin: x86 boot sector; partition 1: ID=0xfd, active, starthead 32,
startsector 2048, 785137 sectors; partition 2: ID=0xfd, starthead 0,
startsector 787185, 15631245 sectors; partition 3: ID=0xfd, starthead 0,
startsector 16418430, 8000370 sectors; partition 4: ID=0x5, starthead 254,
startsector 24418800, 1929101265 sectors, code offset 0x63
[root@wisdom boot]# file - < /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3,
boot drive 0x80, 1st sector stage2 0x842a9; partition 1: ID=0xfd, active,
starthead 32, startsector 2048, 785137 sectors; partition 2: ID=0xfd,
starthead 0, startsector 787185, 15631245 sectors; partition 3: ID=0xfd,
starthead 0, startsector 16418430, 8000370 sectors; partition 4: ID=0x5,
starthead 254, startsector 24418800, 1929101265 sectors, code offset 0x63
My concern is if I were to loose /dev/sda I want to be able to boot via
/dev/sdb.
yes, because /dev/sda does NOt have GRUB, /dev/sdb has
Or am I reading the output from file wrong and its actually /dev/sda
that
doesn't have grub2 installed on it?
you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
no idea howyou are interpreting your outputs
3:46 p.m.
> My concern is if I were to loose /dev/sda I want to be able to
boot via
> /dev/sdb.
yes, because /dev/sda does NOt have GRUB, /dev/sdb has
> Or am I reading the output from file wrong and its actually /dev/sda
> that
> doesn't have grub2 installed on it?
you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
no idea howyou are interpreting your outputs
ok, misinformation from this post?
http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
Now the question is who is right? I'm starting to believe the post I
quoted above is incorrect.
Jeff
3:51 p.m.
Am 02.05.2012 22:46, schrieb Jeffrey Ross:
>> My concern is if I were to loose /dev/sda I want to be able to boot via
>> /dev/sdb.
>
> yes, because /dev/sda does NOt have GRUB, /dev/sdb has
>
>> Or am I reading the output from file wrong and its actually /dev/sda
>> that
>> doesn't have grub2 installed on it?
>
> you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
> no idea howyou are interpreting your outputs
>
>
ok, misinformation from this post?
http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
Now the question is who is right? I'm starting to believe the post I
quoted above is incorrect.
not 100% sure, but here i have a 4 disk RAID1/RAID10/RAID10 setup
originating from F14 and upgraeded to F15 and F16
i did the same as with GRUB1
grub2-install /dev/sda
grub2-install /dev/sdb
grub2-install /dev/sdc
grub2-install /dev/sdd
it boots from any disk as also another from F15 to F16
upgraded system does this way after "hotplug" any disk
from the RAID1 device and it boots surely with GRUB2
__________________________
[root@srv-rhsoft:~]$ file - < /dev/sda
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive
0x80, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048,
1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd,
starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63
[root@srv-rhsoft:~]$ file - < /dev/sdb
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive
0x81, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048,
1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd,
starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63
[root@srv-rhsoft:~]$ file - < /dev/sdc
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, stage2 address
0x2000, stage2 segment
0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 1024000 sectors;
partition 2: ID=0xfd,
starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd, starthead 254,
startsector 31746048,
3875225600 sectors, code offset 0x63
[root@srv-rhsoft:~]$ file - < /dev/sdd
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version 0x3, boot drive
0x83, stage2 address 0x2000,
stage2 segment 0x200; partition 1: ID=0xfd, active, starthead 32, startsector 2048,
1024000 sectors; partition 2:
ID=0xfd, starthead 221, startsector 1026048, 30720000 sectors; partition 3: ID=0xfd,
starthead 254, startsector
31746048, 3875225600 sectors, code offset 0x63
4:01 p.m.
On 05/02/2012 01:46 PM, Jeffrey Ross wrote:
ok, misinformation from this post?
http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
Now the question is who is right? I'm starting to believe the post I
quoted above is incorrect.
It's possible that it was correct when written, but AFAICT it's wrong
now. I have two physical drives, with grub2 installed on sda, as you
can clearly see here:
[root@khorlia ~]# file - </dev/sda
/dev/stdin: x86 boot sector; GRand Unified Bootloader, stage1 version
0x3, boot drive 0x80, 1st sector stage2 0x686489a; partition 1: ID=0xc,
active, starthead 1, startsector 63, 83885697 sectors; partition 2:
ID=0x83, starthead 254, startsector 83891430, 401625 sectors; partition
3: ID=0x83, starthead 254, startsector 84293055, 20964825 sectors;
partition 4: ID=0x5, starthead 254, startsector 105257880, 54813780
sectors, code offset 0x63
[root@khorlia ~]# file - </dev/sdb
/dev/stdin: x86 boot sector; partition 1: ID=0x8e, starthead 1,
startsector 63, 8001 sectors; partition 2: ID=0x83, starthead 0,
startsector 8064, 3499776 sectors; partition 3: ID=0x5, active,
starthead 0, startsector 3507840, 2838528 sectors, code offset 0x2
8:06 p.m.
On Thu, May 3, 2012 at 5:46 AM, Jeffrey Ross <jeff(a)bubble.org> wrote:
>> My concern is if I were to loose /dev/sda I want to be able to boot via
>> /dev/sdb.
>
> yes, because /dev/sda does NOt have GRUB, /dev/sdb has
>
>> Or am I reading the output from file wrong and its actually /dev/sda
>> that
>> doesn't have grub2 installed on it?
>
> you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
> no idea howyou are interpreting your outputs
>
>
ok, misinformation from this post?
http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
Now the question is who is right? I'm starting to believe the post I
quoted above is incorrect.
Jeff
The information you will be missing when grub2 is loaded is the string
"GRUB version 0.94" when you do it that way.
Also, grub2 is a work in progress. Things will change.
But the particularly post you were referring to was probably
misinterpreting something, most likely the drive letters (which, as
you might know, tend not to be stable, and, particularly not the same
letters when grub sees them at boot as when the OS, including the grub
tools, see them after the boot-up process is complete).
--
Joel Rees
5:16 a.m.
On Wed, 2 May 2012 16:46:25 -0400, JR (Jeffrey) wrote:
>> My concern is if I were to loose /dev/sda I want to be able to boot via
>> /dev/sdb.
>
> yes, because /dev/sda does NOt have GRUB, /dev/sdb has
>
>> Or am I reading the output from file wrong and its actually /dev/sda
>> that
>> doesn't have grub2 installed on it?
>
> you see "GRand Unified Bootloader" on /dev/sdb and not on /dev/sda
> no idea howyou are interpreting your outputs
>
>
ok, misinformation from this post?
http://lists.fedoraproject.org/pipermail/users/2012-February/414336.html
Now the question is who is right? I'm starting to believe the post I
quoted above is incorrect.
Certainly. Not only do you refer to a post that's a few months old.
For your /dev/sdb, "file" said "GRand Unified Bootloader", which
means
it detected GRUB. Then you reinstalled GRUB to sdb only to find that
"file" still detects a "GRand Unified Bootloader" while you expected
it
to not do that. That's been a weird assumption, IMO, leading to a wrong
conclusion.
--
Fedora release 17 (Beefy Miracle) - Linux 3.3.4-1.fc17.x86_64
loadavg: 0.06 0.08 0.22
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participants (5)
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