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

[Ing. Josef Klotzner]

Btw: i like Your Atari logo ... i am still owning a Mega STE and a Falcon,
which i had to repair last time as battery of battery buffered NVRAM was
dead. Now it still and again is alive !!  :D


2013/8/24 Josef Klotzner <josef.klotzner at gmail.com>

> 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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https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1093918/+subscriptions