Description of problem:
After expanding a cciss hw raid array with new disks, the new disc size is visible in Linux, but the kernel doesn't update its understanding of physical volume size, not even triggered manually via cciss driver. 


Version-Release number of selected component (if applicable):
kernel-2.6.18-164.15.1.el5.centos.plus.x86_64


How reproducible:
Always.

Steps to Reproduce:
1. Expand cciss disks with hpacucli
2. echo "rescan" > /proc/drivers/cciss/cciss0
3. error is given
  
Actual results:
Cannot on-line pvresize the block device.

# echo "rescan" > /proc/driver/cciss/cciss0 
-bash: echo: write error: Invalid argument

Rebooting the system makes expanded disks visible.

Expected results:
working pvresize, lvextend, etc.

Additional info:
This is a centos 5 box. p800 controller.