Hello
I've found strange problem in new Fedora 15. I suppose it should work. It's maybe fdisk or grub problem.
Normaly I have this (working) multiboot solution on my home PC:
On first small (100MB) partition are grub1 files only with this config (grub is installed to MBR):
--- cut --- title Fedora 15 root (hd0,2) chainloader +1 title Fedora 14 root (hd0,4) chainloader +1 title Ubuntu root (hd0,5) chainloader +1 --- cut ---
Grub of linux distributions is installed into their partitions
I want make the same on mirrored environment
2 HD in mirror (raid1): size id OS/SW FS 1. part 200MB fd grub ext4 2. part 8GB 82 SWAP swap 3. part 10 GB fd fedora 15 ext4 4. part extended 5. part 10 GB fd fedora 14 ext4 6. part 10 GB fd ubuntu ext4 ... last part rest. of disk - LVM
I've installed Fedora 15 on /dev/md0 (/dev/sda1,/dev/sdb1) /boot /dev/md1 (/dev/sda3,/dev/sdb3) / grub was in MBR and everything worked. THIS WORKS: grub> root (hd0,0) grub> setup (hd0)
When I want put grub of Fedora 15 to start of /dev/sda3 grub is complaining:
THIS DOESN'T WORK: grub> root (hd0,2) grub> setup (hd0,2) Error 17: cannot mount selected partition
Without mirror (raid1) it works. With raid1 it works only on first partition. Can you explain me why?
Thanks in advance
Pavel
On Wed, Jun 29, 2011 at 23:16:01 +0200, Pavel Lisy pali@tmapy.cz wrote:
THIS DOESN'T WORK: grub> root (hd0,2) grub> setup (hd0,2) Error 17: cannot mount selected partition
Without mirror (raid1) it works. With raid1 it works only on first partition. Can you explain me why?
One possible reason is that the raid information may be at the start of the partition. You want to be using version 0.9 or 1.0. The default version is 1.2. When installing anaconda gives the /boot partition the appropriate version when creating the array. You can check the version with mdadm -D .
On Wed, Jun 29, 2011 at 16:18:22 -0500, Bruno Wolff III bruno@wolff.to wrote:
One possible reason is that the raid information may be at the start of the partition. You want to be using version 0.9 or 1.0. The default version is 1.2. When installing anaconda gives the /boot partition the appropriate version when creating the array. You can check the version with mdadm -D .
One note on this. The man page info for the -e option is incorrect. -e 1 is equivalent to -e 1.2, not -e 1.0 is stated in the man page.
Bruno Wolff III píše v St 29. 06. 2011 v 16:27 -0500:
On Wed, Jun 29, 2011 at 16:18:22 -0500, Bruno Wolff III bruno@wolff.to wrote:
One possible reason is that the raid information may be at the start of the partition. You want to be using version 0.9 or 1.0. The default version is 1.2. When installing anaconda gives the /boot partition the appropriate version when creating the array. You can check the version with mdadm -D .
One note on this. The man page info for the -e option is incorrect. -e 1 is equivalent to -e 1.2, not -e 1.0 is stated in the man page.
Hello
You are right
Anaconda in F15 makes mirror for /boot with version 0.9 and others with 1.1. Solution is make mirror yourself (in console with bash) with version 0.9 or 1.0. Then grub can understand filesystems on it.
Thank you very much
Pavel
On Wed, Jun 29, 2011 at 5:16 PM, Pavel Lisy pali@tmapy.cz wrote:
I've found strange problem in new Fedora 15. I suppose it should work. It's maybe fdisk or grub problem.
Normaly I have this (working) multiboot solution on my home PC:
On first small (100MB) partition are grub1 files only with this config (grub is installed to MBR):
--- cut --- title Fedora 15 root (hd0,2) chainloader +1 title Fedora 14 root (hd0,4) chainloader +1 title Ubuntu root (hd0,5) chainloader +1 --- cut ---
Grub of linux distributions is installed into their partitions
I want make the same on mirrored environment
2 HD in mirror (raid1): size id OS/SW FS
- part 200MB fd grub ext4
- part 8GB 82 SWAP swap
- part 10 GB fd fedora 15 ext4
- part extended
- part 10 GB fd fedora 14 ext4
- part 10 GB fd ubuntu ext4
... last part rest. of disk - LVM
I've installed Fedora 15 on /dev/md0 (/dev/sda1,/dev/sdb1) /boot /dev/md1 (/dev/sda3,/dev/sdb3) / grub was in MBR and everything worked. THIS WORKS: grub> root (hd0,0) grub> setup (hd0)
When I want put grub of Fedora 15 to start of /dev/sda3 grub is complaining:
THIS DOESN'T WORK: grub> root (hd0,2) grub> setup (hd0,2) Error 17: cannot mount selected partition
Without mirror (raid1) it works. With raid1 it works only on first partition. Can you explain me why?
When you install grub to a partition's boot sector, a list of the blocks "occupied" by grub's stage1 has to be stored in the first sector of that partition. Assuming that there's enough space there for it when you're using mdraid (I suspect that you'd have to ensure that you're using a metadata version that embeds the metadata elsewhere), I don't think that you can point at a file through blocks because grub has no knowledge of mdraid - hence the "cannot mount selected partition" error.
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Bruno Wolff III -
Pavel Lisy -
Tom H