On Tue, 2006-10-17 at 22:21 +0200, Bruno Costacurta wrote:

Hello,

I built my first RAID with 2 disks. 

Array looks active (please see hereafter) but I'm confusing about size : 
having 2 disks of 160-Gb each I expect a size of 160-Gb (correct ?) but array 
size seems around 103-Gb.

Your array is not 103-Gb, but 103-Mb.

Disk /dev/md0: 106 MB, 106823680 bytes
2 heads, 4 sectors/track, 26080 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

'mdadm --detail /dev/md0'  :
-start-
/dev/md0:
        Version : 00.90.03
  Creation Time : Tue Oct 17 21:26:43 2006
     Raid Level : raid1
     Array Size : 104320 (101.89 MiB 106.82 MB)
    Device Size : 104320 (101.89 MiB 106.82 MB)

What did you do to create the device?  Did you change the disks
recently, or add new disks?

You could try to grow the RAID (mdadm -G /dev/md0 -z max), but I would
be wary of doing that until I knew why the disks showed the small size.

Forrest