PE2550 PERC 3/Di afacli raid5 problem

[E Y]

I am sorry that I have little knowledge on afacli, and we just faced a
slot 3 HD dead.

Our only raid 5 have initialized 2 "lun", one for system (label
"boot") and one of data (label "data").

container list      
Executing: container list
Num          Total  Oth Chunk          Scsi   Partition
Label Type   Size   Ctr Size   Usage   B:ID:L Offset:Size
----- ------ ------ --- ------ ------- ------ -------------
 0    RAID-5 15.0GB 	  32KB Open    0:00:0 64.0KB:5.00GB 
 /dev/sda             boot             0:01:0 64.0KB:5.00GB 
                                       0:02:0 64.0KB:5.00GB 
                                       0:03:0 64.0KB:5.00GB 

 1    RAID-5 35.8GB 	  32KB Open    0:00:0 5.00GB:11.9GB 
 /dev/sdb             data             0:01:0 5.00GB:11.9GB 
                                       0:02:0 5.00GB:11.9GB 
                                       0:03:0 5.00GB:11.9GB 


I first shutdown the linux and make unplug the dead HD and plug in a
new one.  I then boot to the raid controller bios and hope it
re-generate the the new disk.

Both lun rebuild the disk good initially, however, after a while the
system "lun" (label "boot") one got the status to "critical" after
around 5% rebuild.  The data "lun" continue to rebuild to ok.

The linux appear to be ok, but the system lun got unprotected as
showed at afacli, as showed as follows:

container	list /full
Executing: container list /full=TRUE
Num          Total  Oth Chunk          Scsi   Partition               
                      Creation        System
Label Type   Size   Ctr Size   Usage   B:ID:L Offset:Size   State   RO
Lk Task    Done%  Ent Date   Time      Files
----- ------ ------ --- ------ ------- ------ ------------- ------- --
-- ------- ------ --- ------ -------- ------
 0    RAID-5 15.0GB 	  32KB Open    0:00:0 64.0KB:5.00GB UnProt     	 
             	  0  010202 10:49:43
 /dev/sda             boot             0:01:0 64.0KB:5.00GB UnProt    
	               	  1  010202 10:49:43
                                       0:02:0 64.0KB:5.00GB UnProt    
	               	  2  010202 10:49:43
                                       0:03:0 64.0KB:5.00GB UnProt    
	               	  3  010202 10:49:43

 1    RAID-5 35.8GB 	  32KB Open    0:00:0 5.00GB:11.9GB            	 
             	  0  010202 10:50:01
 /dev/sdb             data             0:01:0 5.00GB:11.9GB           
	               	  1  010202 10:50:01
                                       0:02:0 5.00GB:11.9GB           
	               	  2  010202 10:50:01
                                       0:03:0 5.00GB:11.9GB           
	               	  3  010202 10:50:01

I have tried the above rebuild with another HDs two time.  Since the
rebuild of data is quite long....What would be the best bet to
generate the new disk parity of system lun?  Please help...