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[Bug 1018185] New: [doc] [grub2] Explanation about boot code locations not up to date
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 04 Jan 2017 19:46:39 +0000
  • Message-id: <bug-1018185-21960@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1018185


Bug ID: 1018185
Summary: [doc] [grub2] Explanation about boot code locations
not up to date
Classification: openSUSE
Product: openSUSE Distribution
Version: Leap 42.2
Hardware: Other
OS: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Documentation
Assignee: fs@xxxxxxxx
Reporter: richard.bos@xxxxxxxxx
QA Contact: fs@xxxxxxxx
Found By: ---
Blocker: ---

Procedure 12.1: Changing the Boot Loader Location

https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.reference/cha.grub2.html#pro.sec.grub2.yast2.location

Following a discussion about the boot code location in #1017677#c3 it appears
that the documentation at the web is out of date.


In case you can take care for the above mentioned items, I create another
bug ticket to address this: see if the explanation on the web can explain
'when to select which of the three options':

https://doc.opensuse.org/documentation/leap/reference/html/book.opensuse.
reference/cha.grub2.html#pro.sec.grub2.yast2.location

ok, in fact this section of documentation is wrong as it changed for Leap
42.2 and TW. Now MBR use disk MBR where "/boot" lives. so if "/boot" is on
/dev/sdb6, then it install grub2 to /dev/sdb. Also boot from root is not
default. Default proposal is very complex code that consider partitioning
setup. So currently default is pick between root/boot partition and MBR
depending on disk setup.

Is the code saved to the root partition or is it saved to the /boot/grub2?

Imagine that /boot has its own partition it is no longer saved to the root
partition, but to the /boot partition (if the code is indeed saved to
/boot/grub2).
PS: a long time ago I had indeed a separate partition for /boot...

As such: are there requirements for the custom partition? If so what is the
requirement? Must /boot/grub reside on that partition? When there are
requirements,
have them stated in the documentation, please.

If there is a separate /boot partition, it must be /boot. Correct?


For help to user which option use when it is not so easy. In general if
opensuse is only system on disk, then MBR is always good option. If there are
more systems and that system can chainload ( almost majority of current OSes
), then boot from partition is good idea unless it use specific partitioning
scenarios ( it is quite long list including encrypted partitions, RAIDs and
more. I will need more digging if you want exact list when what can be used).

It would be good to have this information (as is above) included in the web
documentation. The documentation just needs some love....

If you can't explain when to use which of the three option, how should the
regular user
know ( I mean the user that must use the bootloader GUI, for whatever reason ).

Making a mistake here, can have far reaching effects e.g. making the system
completely unavailable. Hence good documentation is appreciated.

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