External HP SDLT Not detecting

[pp p]

 Hi !!!
"Greetings for the Day !!!"
I'm having HP ML570 G4 server with Rehdat Linux 9 installed. I've attached
External HP SDLT Storageworks 320 drive. It detects  in POST and BIOS while
I reboots the Server. But while in OS, It doesn't detect in Hardware Browser
also, Even I ran "kudzu -s ", checked in /proc/scsi/scsi it shows "Attched
Devices : None", I run "sgcheck" also.!!! Please help !! Your suggestions
are most welcome..Thanks in advance..!!!!