raid10 and lvm problem on new lenny install

[Jim Green <student.northwestern@gmail.com>]

this is what I have from fdisk -l, I have lvm on /dev/md1, md1 is a
raid10 array with 4x2T drives.
Disk /dev/md1: 4000.5 GB, 4000525058048 bytes
2 heads, 4 sectors/track, 976690688 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 2097152 bytes
Disk identifier: 0x00000000


this is what I have from pvdisplay
  --- Physical volume ---
  PV Name               /dev/md1
  VG Name               2600k
  PV Size               3.64 TiB / not usable 0
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              953799
  Free PE               831052
  Allocated PE          122747
  PV UUID               WUpkTR-xyCK-HGOc-Hk7Q-OfBp-Mqsz-GubCy7

I don't know why I only have a 3.64T pv size, it should be 4T I think,
in the installation of lenny i use ext3 for all the partitions,
also I set the unused space for each partition as 1%.

Thank you if you  have an explanation or if you have ways to reclaim
the 0.36 T from my arrays.

Jim