LVM: 200G + 200G = 376G ?!?
Paul Howarth
paul at city-fan.org
Wed Aug 10 17:53:22 UTC 2005
On Wed, 2005-08-10 at 19:11 +0200, Colin Brace wrote:
> Hi all,
>
> I have two 200G HDs with which I would like to create is single LVM volume.
>
> To begin with, I created one single primary partition on each of the
> drives. Here is the fdisk output:
>
> Disk /dev/sda: 200.0 GB, 200049647616 bytes
> 255 heads, 63 sectors/track, 24321 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 1 24321 195358401 83 Linux
>
> Disk /dev/sdb: 203.9 GB, 203928109056 bytes
> 255 heads, 63 sectors/track, 24792 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 24792 199141708+ 83 Linux
>
> Next I ran pvcreate on each. With vgcreate I then created a groups
> called "zinka" consisting of /dev/sda1 /dev/sdb1
>
> Now I wanted to create a single logical volume called "films":
>
> lvcreate -n films -L 400G zinka
>
> However, lvcreate complained:
>
> Insufficient free extents (96310) in volume group zinka: 102400 required
>
> By trial and error, I discovered that I could only make a volume 376G in
> size. What is happening to those other 24Gs?
>
> Here is the output of vgdisplay:
>
> --- Volume group ---
> VG Name zinka
> System ID
> Format lvm2
> Metadata Areas 2
> Metadata Sequence No 8
> VG Access read/write
> VG Status resizable
> MAX LV 0
> Cur LV 1
> Open LV 0
> Max PV 0
> Cur PV 2
> Act PV 2
> VG Size 376.21 GB
> PE Size 4.00 MB
> Total PE 96310
> Alloc PE / Size 96256 / 376.00 GB
> Free PE / Size 54 / 216.00 MB
> VG UUID TzCRA5-y8er-O14N-4b8D-fQMA-J1l0-iCYKtR
What's the output of "fdisk -l" and "vgdisplay -v"?
You could also do "lvextend --extents +54 /dev/zinka/films" to at least
use up that unallocated 216MB.
Paul.
--
Paul Howarth <paul at city-fan.org>
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