Re: error: embedding is not possible, but this is required for RAID and LVM install.

[bl0]

On Friday 04 April 2014 17:58:33 Andrey Borzenkov wrote:
> В Wed, 2 Apr 2014 12:47:33 +0200
>
> bl0 <address@hidden> пишет:
> > On Monday 31 March 2014 18:22:57 Andrey Borzenkov wrote:
> > > В Mon, 31 Mar 2014 17:32:20 +0200
> > >
> > > bl0 <address@hidden> пишет:
> > > > On Sunday 30 March 2014 19:04:55 Andrey Borzenkov wrote:
> > > > > Well, modern systems tend to start first partition on 1M
> > > > > boundary.
> > > >
> > > > Does this mean that grub2 will only support hard disks partitioned
> > > > recently and will not support hard disks which have been in use for
> > > > a longer time?
> > >
> > > address@hidden:~> LC_ALL=C ll /boot/grub2/i386-pc/core.img
> > > -rw-r--r-- 1 root root 26480 Jan 14 22:06
> > > /boot/grub2/i386-pc/core.img
> >
> > Some info where the size comes from:
>
> I know. I was replying to "will not support hard disks which have been
> in use for a longer time". You really cannot squeeze every conceivable
> feature into 32K.

Not every conceivable feature, only these features already supported in past 
versions of grub2 such as 1.97. This could be seen as a regression.

> > $ /opt/grub2/bin/grub-mkimage -O i386-pc [module ...] | wc -c
> > 31467  biosdisk part_msdos lvm minix
> > 29941  biosdisk part_msdos lvm
>
> It actually takes even less than I expected (note that it also pulls
> in diskfilter).
>
> > 23047  biosdisk part_msdos
> > 22214  biosdisk
> > 20165  (kernel only)
> > (minix smaller than tar or cpio on v2.00 but still doesn't fit)
>
> You may be interested in
> http://marc.info/?l=grub-devel&m=139175222350026&w=2

Thanks, I will test it. Could be one more way to install grub.

> > My filesystems is mainly zfs on lvm, but grub can store its data on a
> > separate lvm volume in any simple format it wants. I can't easily
> > create more msdos partition table entries because of the stupid limit
> > of 11 partitions in some linux (kernel) versions.
>
> With LVM you need just 2 partitions at most. 

If you start with an empty disk, yes. I hit the partition limit first and 
started moving to lvm later. So it depends on how many non-contiguous areas 
on disk you allocate to lvm. Plus non-lvm partitions such as windows 
partitions.

> And with zfs directly, 
> without LVM, you have enough space to store bootloader (128K).

Personally I would not put whole disk under control of zfs, zfs has some 
disadvantages too. For people who do, yes they can boot from it.

-- 
bl0