Expand a raid volume

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Hi Admins,

I have a server with an Adaptec 2120S Raid controller. There are were 
6 x 174GB disks and one hot spare. I moved the hotspare into the RAID 
5 volume and the Adaptec Storage Manager shows the volume has grown 
from 681 to 821GB. 

My problem is that the OS doesn't see it that way. If I remount the 
volume it is still seen as a 681Gb volume.

/dev/sda5              681G   608G    38G  95% /data

It I do fdisk /dev/sda5 doesn't show me the same information, and 
doesn't list any size. The filesystem is ext3.

Disk /dev/sda5: 705.4 GB, 705416431104 bytes
255 heads, 63 sectors/track, 85761 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

     Device Boot      Start         End      Blocks   Id  System

When I tried to write the new disk label it failed

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 22: Invalid 
argument.
The kernel still uses the old table.

Does anyone know what I need to do to expand the current volume? Is 
it possible? 

TIA.
Dp.

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