On Thu, Dec 31, 2009 at 1:46 PM, Gerry Reno <greno@xxxxxxxxxxx> wrote:
>> At this point it's probably easiest to just create another virtual
>> disk with one primary partition, and copy the contents of the original
>> /boot there. It's A LOT easier compared to messing up with existing
>> partition table. Your domU config should then look something like this
>>
>> disk = [ "tap:aio:/var/lib/xen/images/CLOUD-CC-1-boot.img,xvda,w",
>> "tap:aio:/var/lib/xen/images/CLOUD-CC-1.img,xvdb,w" ]
>>
>
> If I do this then maybe I can straighten the original partition table out;
> remove the last two partitions and create a primary active partition for
> /boot.
If you want to use a new disk image for /boot, then yes, the disk
image only need one small partition. You can still use LVM from the
orginal disk -- no need to migrate/copy that.
If you want to modify the existing partition table manually, BE
CAREFUL. fdisk uses cylinders as unit by default, so you should switch
to sectors. Here's an example:
# fdisk -l /dev/xvda
Disk /dev/xvda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 1 1000 8032468+ 8e Linux LVM
/dev/xvda2 1001 1305 2449912+ 5 Extended
/dev/xvda5 * 1001 1305 2449881 83 Linux
# fdisk -lu /dev/xvda
Disk /dev/xvda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 63 16064999 8032468+ 8e Linux LVM
/dev/xvda2 16065000 20964824 2449912+ 5 Extended
/dev/xvda5 * 16065063 20964824 2449881 83 Linux
Now if you recreate the partition table using cyulinders as unit, the
Linux partition will start on the wrong sector. It will be unusable.
However if you use sectors as unit (fdisk -u) you can recreate the
partition table to be like this
# fdisk -lu /dev/xvda
Disk /dev/xvda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/xvda1 * 16065063 20964824 2449881 83 Linux
/dev/xvda2 63 16064999 8032468+ 8e Linux LVM
Partition table entries are not in disk order
pygrub can work with that.
--
Fajar
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