LVM: 200G + 200G = 376G ?!?

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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

Thanks,

--
 Colin Brace | cb@xxxxxx
 Amsterdam
 http://www.lim.nl



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