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

Colin Brace cwb at lim.nl
Wed Aug 10 17:11:41 UTC 2005


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 at lim.nl
  Amsterdam
  http://www.lim.nl





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