Re: Adding a logical volume

Colin Paul Adams wrote:

"Jim" == Jim Cornette <fc-cornette@xxxxxxxxxxxxxx> 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:
----------------------------------
[tim@carrie ~]$ sudo pvcreate /dev/sdb2
Physical volume "/dev/sdb2" successfully created
[tim@carrie ~]$ sudo vgcreate vg /dev/sdb2
Volume group "vg" successfully created
[tim@carrie ~]$ sudo vgdisplay vg
--- Volume group ---
VG Name vg
...
[tim@carrie ~]$ sudo lvcreate -L 20G -n slash vg
Logical volume "slash" created
[tim@carrie ~]$ sudo lvcreate -L 10G -n home vg
Logical volume "home" created
[tim@carrie ~]$ sudo lvcreate -L 2G -n swap vg
Logical volume "swap" created
[tim@carrie ~]$ 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.


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

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