Where to install grub?on another partition?or in the / ?

hi
i'm tring to install arch
where i need to install grub?on the root partition(/)?
because after i finished the instaltion and rebooted, windows load up normally:/
Last edited by dids22 (2007-02-06 22:30:22)

jwbirdsong wrote:
Instaling it to the MBR is the most common method....although either CAN work...
to install to MBR, as root
grub-install /dev/h(s)da
More good info on WIKI
so why windows boot up normally and not grub??

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[SOLVED] Dualboot w7 + Arch ( where to install grub )

Hello,
I have win 7 already installed,
now i want to install Archlinux on same disk, but on other partitions.
My currently partiotion schema ( MBR ) looks like:
/dev/sda1 win7
/dev/sda2 reserverd for linux boot part
/dev/sda3 reserverd for linux root
I readed beginners guide, and the only one thing is not clear for me,
beginners guide advises not to install grub on any partiorion only on disk's mbr /dev/sda
I can not do that, because it will destroy my win7's mbr( partion table and so on )
Earlier with this configuration i had sabayon linux installed,
with grub on /dev/sda2, both systems booted with bcdedit and all worked fine.
How can I solve this ( grub2 can not be installed in /dev/sdaX )
Thanks for any help.
Last edited by tangram (2013-11-18 09:55:29)

tangram wrote:
henk wrote:... Why do you personally think grub will update to /dev/sda? Do you know how grub works that well? ...
I do not know, I felt it so, earlier linux experiences, maybe better I should write "I suppose".
It is not a question of knowing grub. It is a question of knowing Arch. When pacman updates grub, it does not reinstall to disk, it does not generate a new configuration file and it does not, therefore, touch either the MBR or the BIOS boot partition or any installation to a partition or anything else. The most pacman will do is remind you to do these things, as necessary. And sometimes it does not even do that.
This is why, for example, it is possible to maintain grub.cfg manually in Arch but not in most other distros. Because the system will never, ever run grub-mkconfig unless you tell it to. So a manually maintained configuration file will never be overwritten unless you overwrite it.
The only boot manager/loader I know of where this is not the case is gummiboot and IMNSHO, that makes the gummiboot package a badly behaved one which fails to properly respect the local customs. (And I won't install gummiboot for essentially this reason.)
That said, installing grub to a partition is not recommended because it is very easily broken. So I don't think you should do that. I'm just saying that if you did do it, no pacman upgrade would ever write to the MBR. Nor, for that matter, would it update the installation on the partition. It would do zilch to upgrade the actual installation of the boot loader - it would just update the package files in your system.
Last edited by cfr (2013-11-03 03:15:34)

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Where to install grub

Please forgive this simple question but in my search for an answer in wikis and other places, I cannot find a straightforward answer (and part of my worry is related to problems installing in this post, where it seems like when the kernel was updated it did so in the wrong place).
I have the following setup on my Toshiba Portege R500:
sda1 Windows XP
sda2 Windows/Toshiba rescue partition
sda3 share vfat partition
sda4 extended partition:
sda5 boot
sda6 swap
sda7 /
When I initially installed arch, I installed it in "/dev/sda", which is what it seemed to me most of the advice said to do (and it was the default as well). After I did pacman -Syu and copied over the new pacman.conf I rebooted but it seems to be booting a 2.6.25 kernel and the system is set up for 2.6.26. I'm giving up and reinstalling.
So, my question is:
Should I install grub on "/dev/sda" or "/dev/sda5", and if I can do it on either, what is the advantage of one over the other?

OK, that's settled. In menu.lst, then, should I have:
title Arch Linux
root (hd0,4)
kernel /boot/vmlinuz26 root=/dev/sda5 ro
title Windows XP
rootnoverify (hd0,0)
makeactive
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[SOLVED] Formatting and installing windows on another partition

Hello..
I'm planning to reformat my Windows XP partition with GParted and install Windows 7 on it instead.
When I remove the "boot" flag on my /boot partition before doing anything, then format the partition, install Windows 7 on and put the "boot" flag back with GParted live CD, everything should be working fine, shouldn't it?
Or will formating the Windows partition somehow affect Arch (as I'm accessing it with Arch)?
Or will Windows bootloader still overwrite Grub, even if I remove the "boot" flag on it?
Thanks..
Last edited by Psylver (2011-12-01 18:29:42)

Thanks.. you were right, but everything worked fine. Took me some time to figure out how to restore Grub as I didn't realize I installed it to a seperate partition.

Installing grub

I have Windows on an IDE HDD, and Arch Linux on a SATA HDD. The SATA drive is HDD1, which means the IDE drive is HDD0. Windows was already installed on hdd0. The original Windows mbr is still intact.
After installing arch linux, even after reading the tips and hints here, I can't figure out how to install grub. Main reason I'm asking now is because in my own experience, linux boot records are extremely persistent so I don't want to do something to screw up my Windows install again and run the zero drive test to erase the drive and start over. This takes alot of time, and I don't like doing that, so please help! (I don't mind zeroing the drive later if I want to change system configuration, but I don't want to go through reinstalling another operating system just so I can't back here and yell, "Help!" lol )
I came here after reading the line where it wanted me to specify the root, and I knew something was wrong when it auto-detected hd0 partition3. I'm quite sure that will screw up the Windows drive and arch will still not boot.

You only need the boot partition if your machine has an older BIOS with the 1024 cylinder limit - ie the bootloader must be within the first 1024 cylinders. Most machines with the LBA features shouldn't have this problem. You'll still have a boot directory but within the root partition.
Replacing the MBR is almost required for a dual boot. Note that the MBR is not within a partion so it won't blow away the Windows partition. I say "almost required" since apparently you can configure the Windows boot loader to start other OS's but I've never tried it.
The MBR holds a "dumb" 512 byte program that knows where the bootloader is, loads it, and then runs it. The bootloader could be the Win bootloader, LILO, GRUB, the FREEBSD loader, etc. This lives in the "boot" partition of the OS: so the Win loader lives in the Win partition, GRUB lives in boot or root partition, etc. The loader may present the user with a menu then starts an OS.
Windows installs it's own MBR loader which starts the Windows bootloader. For dual boot you need to replace it with the GRUB MBR loader which will start the GRUB bootloader. Then with the proper Windows config in the GRUB menu the GRUB bootloader can "chainload" the Windows bootloader - hence the chainloader command - Windows never knows GRUB was even run.
For simplicity I'd try just a root partition and a swap partition to start out. So in your case the end result would be:
MBR: GRUB MBR loader
part1: windows bootloader & windows
part6: GRUB bootloader & Arch
part7: swap
During installation edit menu.lst and add Windows then allow GRUB to be installed on the MBR. Note that menu.lst in this case does not describe where to install GRUB but how to start OS's. GRUB installation is done by the Arch installation so leave the Arch stanza alone.
Hope that helps. Good luck.

[solved] Cannot complete install, grub fails to boot the new install

I'm using the 2009.08 USB image.
I've tried this 2 weeks ago, tried it again today, same result. (I'm on Win7 meanwhile).
I'm installing arch, everything goes fine.
I've tried 2 setups:
a)
100GB ext4 /
12GB swap
(no separate /boot, should work)
b)
100MB ext3 /boot
100GB ext4 /
12GB swap
Neither a) or b) will boot.
When the newly installed grub boots, I get a error saying:
filesystem type unknown, partition type 0x7
I get this for the ext3, ext4, and windows partitions.
I get it for both a) and b) setups.
I have doublechecked the menu.lst file. I've even created another entry setting root=/dev/sdb1 (as opposed to the default /dev/disks/by-uuid/..).
I should mention, I have two disks, the first (sda) is currently with a Win7 installation, the 2nd (sdb) is the one I'm trying to install Arch again (and failing).
After the reboot, I've tried booting into the livecd again and manually trying to mount /dev/sdb1 /mnt, it works.
Why isn't my grub boothing from ext{3,4}?
Last edited by Frantic (2009-11-05 18:35:15)

Rede wrote:
I was getting that error but after re-installing grub and making some changes to the menu.lst file it was fixed.
I was able to at one stage boot into arch but it gave problems with the root. Now it just seems to freeze while trying to load grub.
I am currently trying yet another install of grub. I have been noticing though that my menu.lst file has been rolling back or not updating when I chroot back into my install after changing it earlier.
Try mounting your /boot partition under /mnt/boot.

[solved] Cannot install grub on Arch installation!

I'm trying to install Arch on my new Laptop. Almost everything works fine until I come to the point where GRUB will be installed (to the MBR). Installaton fails and I'm told to have a look on tty5 for error messages. Doing so I read:
grub> root (hd0,3)
Filesystem type unknown, partition type 0x7
grub> setup (hd0)
Error 17: Cannot mount selected partition
grub> quit
AnyIdeas what I could do?
By the way, I'm installing the 64Bit Version 0.8 on a computer that currently runs "bad, bad Vista". I'm going to kill Vista anyway, sooner or later, but I wanted to have a try on getting them both on one computer. Might that be a problem?
Last edited by saciel (2007-06-06 00:31:15)

The layout preset by the factory is the following:
sda1: some sort of windows configuration backup blabla
sda2: Vista System
then there is roughly one gigabyte of free space then
sda4: which was a preset ntfs partition for data
I decided to turn 4 in arch root partition, leaving everyting else unchanged for an instance (no additional swap/boot partition).
By the way, I tried to install Grub directly on partition 4 (it is an ext3 now), too afterwards, which failed with the same error.
Last edited by saciel (2007-06-06 00:16:07)

Installed Arch on second partition, cannot choose which OS to boot in

Hello. I setup Arch on a second partition and installed everything and installed grub on my root partition, but when I rebooted the system, I wasnt given a boot menu.. it Just defaulted to windows. Heres my setup:
/dev/sda1 Windows
/dev/sda2 Swap
/dev/sda3 Root
Now.. I didnt flag Root as bootable and Im thinking thats it.. is it? and there was one other thing.. in my /mnt/boot/grub/menu.lst file.. I edited the windows XP entry as such:
# Windows XP
title Windows XP
rootnoverify (hd0,0)
chainloader +1
there was a line "makeactive" inbetweee rootoverify ad chainloader.. that wasnt part of the wiki so i deleted it.. is there something else im missing?

Did you install GRUB to MBR or a partition? It needs to be in the MBR to work.
Alternatively, you can use winfailure's boot.ini file to specify that you want to chainload from NTLDR to GRUB, which will work, but you'll need to know exactly where you installed GRUB to do that method.
Also, you were wise to remove that "makeactive" - that'd set the winfailure partition to bootable, negating GRUB on futher boots.
Lastly, GRUB doesn't require that disks be made "active" - the GRUB MBR code is "hardwired" with what partition to chainload to, it's a smart little application.
-dav7

Having trouble installing GRUB

I am running the following command to install GRUB:
grub-install --target=i386-pc --recheck --debug /dev/sda
I get the following error:
grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
grub-install: warning: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged..
grub-install: error: will not proceed with blocklists.
I have 1007 kib free at the beginning of my disk. I thought that was all that was required to install GRUB when I have a GPT disk. Here is how my partitions are laid out:
http://imgur.com/FyBqzZ7
/dev/sda1 is Linux Mint
/dev/sda2 is Windows
/dev/sda3 is Arch Linux
Do I have to create another partition and set the boot grub flag manually?

slithery wrote:
For BIOS/GPT setups you need to create a BIOS boot partition, you can use the free space you've left at the beginning of your disk for this.
https://wiki.archlinux.org/index.php/Gr … structions
I am having trouble using cgdisk to create a 1007 kib partition from that 1007 kib free space.
I am running the following commands:
cgdisk /dev/sda
Then, I select the free space, and press 'New'
As the first sector, I select '40' (Not sure what this means? Is this bytes from the beginning of the hard drive).
For the size in sectors, I select the default, '2008'.
For the type, I type 'ef02' as per the instructions in the link you gave me.
Unfortunately, it creates a partition of size 1004 kib, and leaves 3 kib free space before it.

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I was running out of space and seeing that /var took up some 3GB I decided to move it to another partition and adjust the fstab accordingly. It all worked but on reboot hal didn't start. I tried to reinstall it with pacman and now I am told:
error: database path is undefined
error: could not register 'core' database (could not open database)
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Last edited by toad (2009-04-18 23:15:15)

All that's in /var/cache/pacman/pkg are packages. You can keep packages if you're afraid something will break and only rolling back to older packages will fix it (which for some people it does), but there are some mirrors out there that update slower than others (so the thing is to pick a mirror that syncs often, so if you really need to downgrade, you can grab the older packages from a slower mirror for example).
I clean out my package cache periodically. If something breaks and I need to roll back (which happened to me with the bluetooth upgrade) I usually check the web CVS frontend for the PKGBUILDs and rebuild what I need.
In general, there's no reason to hold on to your cache - and certainly not that big a cache. If you keep it under a GB you should be safe, generally that covers most if not all packages you installed, one version back. You'll have to sift, though.

Where to install grub?on another partition?or in the / ?

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