Re: Resizing underlying LVM partition after cloning to bigger disk

[Scott Arthur <scott@scottatron.com>]

I've been playing around on a test system with a similar partition table.

Have successfully resized 2 to fill the disk extent. Partition 5 however proves to be problematic.

Using fdisk, I tried deleting 2 and 5 and recreating based on sectors, but couldn't recreate 5 on the same starting sector, it told me I was out of bounds. 

I then tried the same thing with fdisk but with cylinders instead and both partitions were recreated okay, but destroyed all my LVM stuff.

I can happily resize 2 using parted but parted wont resize 5.

Should I expect to be able to resize 5, or am I missing the point. Should I simply be creating a partition 6 to fill the additional space opened up by the resizing of partition 2?

On 4 March 2011 21:41, Radu Rendec <radu.rendec@mindbit.ro> wrote:

On Thu, 2011-03-03 at 15:18 -0500, Stuart D. Gathman wrote:
> On Thu, 3 Mar 2011, Scott Arthur wrote:
>
> > Partition Table: msdos
> >
> > Number  Start   End     Size    Type      File system  Flags
> >  1      32.3kB  296MB   296MB   primary   ext4         boot
> >  2      296MB   1000GB  1000GB  extended
> >  5      296MB   1000GB  1000GB  logical                lvm
> >
> > I'm obviously wanting to expand the LVM partition to fill the remaining 1TB
> > of space.
> >
> > Am I able to simply use parted to resize the partition before doing a
> > pvresize etc?
> >
> > Or is it risky to resize the underlying LVM partition?

I wouldn't do that. Instead, I would create a new logical partition,
"format" it as lvm physical volume and then extend the volume group to
use this partition as well.

I think this can be safely done like this:

* turn off lvm;
* note down the exact starting and ending *sector* of partition 5 (using
fdisk -lu)
* use fdisk and delete partition 5 and 2, then re-create partition 2 up
to the full disk size
* re-create partition 5 making sure it's on exactly the same starting
and ending sector as it was before
* create new partition 6

> You are getting to a size where msdos partition tables are risky.
> Don't they crap out at 2TB?

They do. But the "2TB" disk is actually 2000GB, which is safe (it takes
more than 2048GB to run into trouble with m$dos partitions).

Best regards,

Radu Rendec

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