[Bug 1093918] Re: grub-probe auto-detection fails on raid

[Ing. Josef Klotzner]

Sorry, but in the moment it will not be a good idea to destroy my RAID
again only to know, if this would work also with new install.
I have several OS Systems on the Raid besides ~ 1 TB data.
It would take me days of work to test and bring my machine back to state of
before via Backup.
I need it currently every day an am not able to.

I have already tested was P. Susi created to fix that bug. You can trust it
works and implement as it is.
Fact is: if you don't implement susi's fix ubuntu installs will still
TOTALLY fail if you want to install on extended partitions of a Raid. If
you implement it only can improve.

What i can imagine to do, is to test with a life CD, updated to include
fix, if the Raid is mounted and accessible, because either this did not
work properly as far as i can remember. But please don't ask me to destroy
my RAID for a further test. Thank You.

kind regards
Josef

2013/8/18 Launchpad Bug Tracker <1093918 at bugs.launchpad.net>

> ** Branch linked: lp:~ubuntu-branches/ubuntu/precise/multipath-tools
> /precise-proposed
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1093918
>
> Title:
>   grub-probe auto-detection fails on raid
>
> Status in “multipath-tools” package in Ubuntu:
>   Fix Released
> Status in “multipath-tools” source package in Precise:
>   Fix Committed
> Status in “multipath-tools” source package in Quantal:
>   Triaged
>
> Bug description:
>   kpartx was mapping the entire extended partition then stacking the
>   logical partitions on that device.  This exposes a device that
>   otherwise appears to be an entire disk device containing the logical
>   partitions, and this confuses grub.  The extended partition is
>   supposed to only expose the first two sectors to allow LILO to be
>   installed.
>
>   The patch has been applied upstream now, and since this is the only
>   change since quantal, a simple copy to quantal-updates should resolve
>   it there as well.  I have done this in my ppa and the reporter has
>   verified it has fixed the issue.
>
>   TEST CASE:
>
>   Use fdisk to create an extended parition either on a fakeraid disk or
>   an LVM logical volume.  Run kpartx -a /dev/mapper/whatever to activate
>   the partitions on the disk.  Assuming the extended partition is number
>   3, then sudo blockdev --getsz /dev/mapper/whatever3 will report the
>   apparent size of the extended partition.  The size should only be 2
>   sectors regardless of the size of the extended partition.
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1093918/+subscriptions
>

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https://bugs.launchpad.net/bugs/1093918

Title:
  grub-probe auto-detection fails on raid

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