LVM: Resizing physical volumes

[Sarangan Thuraisingham]

Hi all,
   I am using LVM partitions for my 'root' and 'home' mounts; 'boot' is 
on a physical partition. 'df -h' output as follows:

   Filesystem            Size Used Avail Use% Mounted on
   /dev/mapper/linux_part-root
                         6.9G  5.3G  1.3G  81% /
   /dev/mapper/linux_part-home
                          13G  9.1G  3.3G  74% /home
   /dev/hdc5              59M   59M     0 100% /boot

I 've been compiling my own kernel and as you can see my boot partition 
is not big enough. boot is on partition 5. LVM uses Physical volumes on 
partitions hdc4 and hdc6. Partition table, as follows:

   Disk geometry for /dev/hdc: 0kB - 60GB
   Disk label type: msdos
   Number  Start   End     Size    Type      File system  Flags
   1       32kB    16GB    16GB    primary   fat32        boot, lba
   4       16GB    21GB    5371MB  primary
   2       21GB    43GB    22GB    primary   fat32        lba
   3       43GB    60GB    17GB    extended               lba
   5       43GB    43GB    66MB    logical   ext3
   6       43GB    60GB    17GB    logical                lvm

I want to make the boot partition bigger. I tried resizing the physical 
volume(hdc6) using pvresize.
   sudo pvresize /dev/hdc6 --setphysicalvolumesize 15.41GB
   /dev/hdc6: cannot resize to 3944 extents as 3971 are allocated.
   0 physical volume(s) resized / 1 physical volume(s) not resized

  But it fails as all of the Physical Extents(PEs) have been allocated. 
Is there any way of unallocating some of the PEs so that I can resize my 
boot partition. So far the only suggestion I could find online is to do 
a 'pvmove'.

Any ideas welcome.

--
Regards,
  Saru
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ECS, University of Southampton, UK
http://sarangan.thuraisingham.net
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