[linux-lvm] Partitions on same Drive

[James Hawtin]

On 21 Jan 2002, Rene Schumann wrote:

> I have a Problem and hope someone here can help me.
> I have 2 Partitions on a drive.
> 
> [root at desktop root]# fdisk -l /dev/sdb
> 
> Festplatte /dev/sdb: 255 Köpfe, 63 Sektoren, 9730 Zylinder
> Einheiten: Zylinder mit 16065 * 512 Bytes
> 
>     Gerät Booten  Anfang      Ende   Blöcke   ID  Dateisystemtyp
> /dev/sdb1             1      4462  35840983+   c  Win95 FAT32 (LBA)
> /dev/sdb2          4463      9730  42315210   8e  Linux LVM
> 
> I want to delete sdb1 vfat partition and use it as LVM space.
> If i do a "pvcreate vg01 /dev/sdb1" it is ugly for performance because
> there are 2 LVM Partions at one drive.
> right?
> If i do lvm partition on sdb1 and do a pvmove,
> Can i resize sdb1 to fit the whole drive and after that lvm use this
> full space? 
> 

I don't think you can resize a PV, however that does not really matter,
just slap another PV in place of it. When you do a lvcreate you can
specify which PV the logical volume is going to take its space from.

lvcreate -n fred_lv -L 1G jim_vg /dev/sdb1

If you wanted to do a strip you can still do it by doing

lvcreate -i 2 -n jim_lv -L 1G shela_vg /dev/sdb1 /dev/sdc1

The only time you would have any difficulties is if you wanted one of the
strips to take from sdb1 and sdb2, if your using concatinated filesystems
it really does not matter that the data is logically in two PVs if you
care about seek orders just specify /dev/sdb1  /dev/sdb2 when allocating.

James