Re: Adding a logical volume

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Colin Paul Adams wrote:

>>>>>> "Jim" == Jim Cornette <[email protected]> writes:
>     Jim> Colin Paul Adams wrote:
>     >> I have uninitialized disk space on my disk (/dev/sda), and I
>     >> have the Logical Volume Management GUI tool system-config-lvm
>     >> 1.1.1 running and looking at the unpartitioned space.
>     >> 
>     >> How do I create a new logical volume group in that space (the
>     >> obvious way seems to be to press the Initialize entity button,
>     >> but that is greyed out)?
>     Jim> You might need to initialize the disk and toggle the
>     Jim> partition to lvm with fdisk or another disk management tool
>     Jim> first. I read that people have setup lvm without partitions a
>     Jim> long while back but not much lately about lvm with no
>     Jim> previous partitions setup.
> How do I do this?
> I have tried with fdisk and got lost.
> I added an extended partition, then tried to change its system id to
> 8e (LVM). It wouldn't let me.
> I don't know how to invoke Disk Druid.
> Are there instructions for this anywhere?

Not sure if this is relevant,
but as I understand it you have to create LVM in a partition
like /dev/sdb2 .

So the first step is to create such a partition with fdisk.
You should give it the LVM partition type (with fdisk),
though I am not sure if this is necessary.

Then you do something like this:
[[email protected] ~]$ sudo pvcreate /dev/sdb2
  Physical volume "/dev/sdb2" successfully created
[[email protected] ~]$ sudo vgcreate vg /dev/sdb2
  Volume group "vg" successfully created
[[email protected] ~]$ sudo vgdisplay vg
  --- Volume group ---
  VG Name               vg
[[email protected] ~]$ sudo lvcreate -L 20G -n slash vg
  Logical volume "slash" created
[[email protected] ~]$ sudo lvcreate -L 10G -n home vg
  Logical volume "home" created
[[email protected] ~]$ sudo lvcreate -L 2G -n swap vg
  Logical volume "swap" created
[[email protected] ~]$ sudo lvdisplay vg

Nb Keep /boot out of the LVM, or grub won't see it.

I've never used a system-config program for this.
On the whole I'd prefer not to.

Timothy Murphy  
e-mail (<80k only): tim /at/
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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