[linux-lvm] Kernel PANIC after partition change on RedHat 8.0

[Yuliy Minchev]

On Sun, 19 Jan 2003, Steven Lembark wrote:

> 
> 
> -- Yuliy Minchev <yuliy at mobiltel.bg>
> 
> > On Sat, 18 Jan 2003, Steven Lembark wrote:
> >
> >>
> >> > I have installed Red Hat Linux 8.0. I've made volume group (rootvg)
> >> > from /dev/md1 (which is raid1). I've put my /boot on /dev/md0.
> >> >
> >> > As you already have noticed - I have two disks.
> >> > After installation I'm making new partiotion /dev/sdb5 i.e.
> >> > And if I change its to type to 8e after reboot kernel panics.
> >> > If I change type of this partition to something different - the system
> >> > boots fine.
> >> >
> >> > I cannot understand where can be the problem.
> >> > I have to say that I made the same configuration on this machine and
> >> > everything was ok. But now I cannot see any difference.
> >>
> >> sdb5 => sub-partition. Are you accidentally carving out
> >> a piece of an existing PV? For example, if you had partitioned
> >> the disk into /dev/sdb[1234] when it was built with sdb4 taking
> >> up most of the device as 8e (i.e., for LVM), then adding sdb5
> >> w/in the area of sdb4 would certianly break things -- and scramble
> >> your LV's during pvcreate on the new partition.
> >
> > I have
> >
> > /dev/sdb1 /boot (member of md0,raid1)
> > /dev/sdb1 member of md1, raid1, on md1 is my volume group
> > /dev/sdb3 fat32
> > /dev/sbd4 extend partion
> > /dev/sdb5 is defined as 8e within sdb4
> >
> > Sorry, but I did not understand your point :(
> 
> One thing people have zapped themselves with in the past
> is something like:
> 
> /dev/sdb4 == one partition
> /dev/sdb5 == another partition whose space is
>              contained w/in /dev/sdb4
> 
> 	pvcreate -ff /dev/sdb4;
> 	vgcreate vg00 /dev/sdb4;
> 	lvcretate ... vg00;
> 
> 	<later in time>
> 
> 	pvcreate -ff /dev/sdb5;
> 	vgcreate vg01 /dev/sdb5;
> 	lvcreate ... vg01;
> 
> at this point the creation of vg01 has overwritten
> data in vg00 becuase the partition /dev/sda5 uses
> disk realestate contained within /dev/sda4. This is
> a matter purely caused by having moultiple partitions
> w/in the same spindle.
> 
> That is why I wondered if you had made the mistake
> of creating a partition w/in an already-existing
> partition which was used as a PV at the time when
> your new partition was created and used.

No, no...
The case is not like this. There is no such overlapping here.

I created my volume group during RH8 installation.
After that I manually created /dev/sdb4 and within /dev/sbd5 with fdisk.
And when I change the type of /dev/sbd5 to 8e in order to be able
to run pvcreate ot it and to add it to my volume groups - the
systems hangs during kernel loading. In fact, the system stops to 
recognise my volume group. That's why it hangs.

yuliy


> 
> 
> 
> --
> Steven Lembark                               2930 W. Palmer
> Workhorse Computing                       Chicago, IL 60647
>                                             +1 773 252 1080
> 
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> 

-- 
  Yuliy Minchev, 
  UNIX Administrator