PowerEdge 2900 PERC 5i RAID5 Problem

Hi,

 

I have a Poweredge 2900 server with a PERC 5i RAID controller. I have a RAID 5 with 4 146GB SAS disks

(1 virtual drive)
As of tonight, two of the drives are reported missing. The server is no longer bootable.
I urgently need help, because I have heard that there is no backup of the server.

 

CTRL -R:

 

VD Mgmt: Two Disks Missing, Two Disks Normal

PD Mgmt: Two Disks foreign, Two Disks Online

 

Many thanks in advance.