Adding new SCSI Hard disk

Hello Everyone,

I have a IBM Netfinity Server with ISA server with RAID 1(Hardware
RAID) enabled.

I am using IBM ServeRAID Raid Controller.

6 months before what i did was , I installed redhat linux 9 (I simply
overwrite it).Squid..

Everything is working fine...

Today one of my hard disk failed...I want to add one more hard disk..

Tell me the step by step procedures.

Once again i summarise :

Previous setup :

OS : Windows Server 2000

Application : ISA Server

Hardware : Raid Controller IBM Serve RAID

Existing Setup :

OS : Redhat Linux 9

Application : Squid

Hardware : I simply format the windows OS and I have installed Linux.

Needed :

OS : RedHat Linux 9

Application : SQUID

I have to add the new SCSI Hot Swappable hard disk and i have to check
the status of the new hard disk

It should be in RAID or standlone...no problem..

Thanks in Advance