If you are doing a fresh re-install, then delete the RAID array, recreate it to include the drive you want to add, then install on it.  If you are not trying to conserve some data, then there is no reason not to re-create your RAID array.  Depending on your controller, you can probably begin to re-install by simply booting to the Windows DVD.  Worst case ... you will need to get the RAID driver from the support site for the controller that you have.

can i add another RAID 1 config 2 HDD with my existing RAID model.......also can u briefly explain when my Windows 2008 server will be crashed then how can i repair or reinstall my windows keeping my other drives existing data.

Yes.  Say you have an existing RAID 1 on which you want to install 2008 and you have two new drives on which you want to set up a RAID 1 ...

I would still recommend deleting, recreating the OS RAID 1 array before installing 2008.  After 2008 is installed, then install OpenManage Server Administrator and use it to configure the two new drives as a Data RAID 1.  If at any time the 2008 install becomes corrupt, or the OS RAID 1 becomes corrupt or fails, then the Data RAID 1 will stay completely intact, unaffected by either the Server 2008 failure or the OS RAID 1 failure.  You could recreate your OS RAID 1 and/or reinstall 2008 on it and not affect the data on the Data RAID 1.

I'm not sure I understood what you were trying to do.  Did you already have Server 2008 installed, and you are trying to re-install without destroying existing data on partitions D, E??  If this is what you are trying to do, then don't recreate the RAID 1, as everything (including D,E) on the RAID 1 will be erased.  You will need to boot to the 2008 DVD, load the RAID driver*, then when Windows shows you the current partitions, delete C ONLY(!), then install to the Unpartitioned Space left behind by deleting the C drive.  This will not affect your D and E drives.  Keep in mind - you mentioned the

* It is not necessary to use a Windows 7 DVD during the install of 2008 ... anyone who said that is the way to do it is doing it wrong.  Once you have booted to the Windows DVD, it will tell you it cannot find any hard drives to install to.  Click on the Load Drivers link in the bottom, left corner of the screen, then load the drivers for the controller that you have via floppy, CD, or USB.  What controller are you using in this?

i am using PERC 6/i...how can i use USB flash drive to load the driver for controller. Is it also applicable in reinstalling windows 2003 server?

And thanks for ur ans.

When you boot to the Server 2008 DVD, if Windows doesn't already have the driver, it will tell you it cannot find any hard drives to install to.  Click the link in the lower left corner that says Load Driver.  You can then load the drivers from CD, USB, or floppy.

Server 2003 does not work the same way.  The only way 2003 knows how to load a driver is from a floppy disk at the F6 prompt during Windows Setup.  Since you probably don't have a floppy drive, you can use nLiteOS.com to integrate the RAID drivers into the installation media.  In order to install 2003 on the R710, your media must have Service Pack 2 (you can use nLite to integrate the Service Pack as well).

If you do not have a floppy there is a huge issue.

The F6 drivers for the CERC are

Dell CERC 6/i Integrated   

Release Date:    6/30/2009
Version:    2.24.0.32, A03
Download Type:    Driver   
    Other Versions
File Format:    Hard Drive
File Size:    155 KB

http://ftp.us.dell.com/sas-raid/DELL_MULTI-DEVICE_A03_R210509.exe

The F6 procedure needs to be done by a device seen at boot time from the CD which is why I still order floppy drives for servers.

Dell CERC 6/i Integrated   

Release Date:    6/30/2009
Version:    2.24.0.32, A03
Download Type:    Driver   
    Other Versions
File Format:    Hard Drive
File Size:    155 KB

http://ftp.us.dell.com/sas-raid/DELL_MULTI-DEVICE_A03_R210509.exe

Dell PERC 5 and PERC 6 Controller
Device Driver for Windows Server 2008 x86

Version: 2.24.0.32

TABLE OF CONTENTS
=================

1.0  Introduction
2.0  Compatibility / Minimum Requirements
3.0  Install Instructions
     3.1  Installing the Driver During Operating System Installation
     3.2  Installing a Windows Driver for a New RAID Controller
     3.3  Updating an Existing Windows Driver
     3.4  Driver Update using Dell Update Package (DUP)
4.0  Fixes or Enhancements in this Release
5.0  Additional Information
6.0  Known Issues

1.0 Introduction
================

This is the driver for following family of PowerEdge Expandable RAID Controller:
 
    PERC 5 Controllers
    PERC 6 Controllers
    CERC 6 Controllers

2.0 Compatibility / Minimum Requirements
========================================

This device driver requires the following minimum Operating System version:

Windows Server 2008 x86 Edition

Minimum PERC 5 FW package version: 5.2.2-0072
Minimum PERC 6 FW package version: 6.2.0-0010
Minimum CERC 6 FW package version: 6.2.0-0010

3.0 Install Instructions
========================

Copy the files from the package to a media device supported by the system.
Windows 2008 supports floppies, USB keys, CD & DVD drives.

3.1 Installing the Driver during Operating System Installation
--------------------------------------------------------------

1. Power up the system and boot to the Microsoft Windows Server 2008 DVD.
2. Follow the on-screen instructions until you reach the
 "Where do you want to install Windows?" section.
3. Select "Drive options (advance)"
4. Press on "New" to create a partition to install Windows 2008, select
   the size in MB and click "Apply" (consult Windows 2008 user manual
   to select a drive size that meets the OS demands).
5. Select "Load Driver" and browse to the location where you have copied
   the Windows 2008 driver.
6. Select the RAID controller used for this installation.  The system will
   automatically select one controller.  Press "Next".
7. After the driver loads you will return to the "Where do you want to
   install Windows?" screen (partitions can be configured on this screen).
   Click "Next" again to continue with the installation process.

NOTE: Dell PERC 5 and PERC 6 RAID controllers have Windows 2008 native
      support.  The OS installation can be executed using the native driver. 
      In such case, when the installation completes the PERC
      driver should be updated, see section "3.3 Updating an Existing
      Windows Driver", for details.

3.2 Installing a Windows Driver for a New RAID Controller
---------------------------------------------------------

Perform the following steps to configure the driver when you add
the RAID controller to a system that already has Windows installed.

1. Power down the system.
2. Install the new RAID controller in the system.
   Refer to Hardware Installation for detailed instructions on installing
   and cabling the controller in the system.
3. Power on the system.
4. Windows 2008 has native support for PERC 5 and PERC 6 controllers, the
   system will identify the new controller and use the native driver.
5. Update with the newer driver following the steps on the next section:
   "3.3 Updating an Existing Windows Driver"

3.3 Updating an Existing Windows Driver
---------------------------------------

Perform the following steps to update the Windows driver for a
RAID controller already installed on your system.

NOTE: It is important that you idle your system before you update the driver.

1. Press "Start" > "Control Panel" > "System and Maintenance" > "System".
   The "View basic information about your computer" screen displays.
2. Click on the "Device Manger" link on the left.
   The "Device Manger" window opens up.
4. Click on "Storage controller"
5. Double-click the RAID controller for which the driver has to be updated.
6. Click on the "Driver" tab and click on "Update Driver" button.
   The screen for the Upgrade Device Driver Wizard displays.
7. Insert the appropriate media (driver diskette/USB key/CD/DVD).
8. Click on "Browse my computer for driver software"
9. Click on "Let me pick from a list of device drivers on my computer"
10.Click on the "Have Disk" button and browse to the appropriate location.
11.Select the RAID controller and click "Next"
12.The new driver will be uploaded, close all windows and reboot the system
   computer for the changes to take effect.

3.4  Driver Update using Dell Update Package (DUP)
--------------------------------------------------

A Dell Update Package (DUP) is a self-contained executable in a standard
Dell package format and each Update Package is designed to update a single
component on your system.

DUP Download
------------

1. Click the Download Now link to download the file.
2. When the File Download window appears, click Save to save the file to
   your hard drive.

Driver Update
-------------

1. Browse to the location where you downloaded the file and double-click
   the new file.
2. Read over the release information presented in the dialog window.
3. Download and install any prerequisites identified in the dialog window
   before proceeding.
4. Click the Install button.
5. Follow the remaining prompts to perform the update.

Silent Driver Update
--------------------

Execute the DUP from the command line (or script) as follow:

 > DRVR_WIN_Rxxxxxx.exe /s /l= /r

   Where: /s  Executes the update silently without user intervention.
          /r  Reboots the system, if required, after performing the update.
          /l=   Appends logged messages to a specified ASCII file;
                         creates a new file if one does not exist.

For more command line options type

 > DRVR_WIN_Rxxxxxx.exe /?

or consult the "Dell Update Package User's Guide".

4.0 Fixes or Enhancements in this Release
=========================================

1. Fixes a potential controller hang issue during shutdown under heavy load.

5.0 Additional Information
==========================

Driver version may be displayed in different manner depending on the
application because the leading zeros are often trimmed and not shown
(i.e.: 02.14.00.32 may be displayed as 2.14.0.32).

6.0 Known Issues
================

1. In Windows, deletion of a virtual disk, followed by creation of a
   virtual disk without initialization may result in a blue screen when
   attempting to format.
   - Workaround -
   Initialization (fast init) of the drives before formatting will
   prevent this issue.  

Server 2008 can load drivers from USB, CD, and floppy.  There is no such thing as F6 in 2008 install.

You should have started a new thread :) 

You mentioned "SAS", so I'm assuming you have a SAS 6/iR or a PERC card that the drives are connected to?  If they are connected to a RAID controller, WHICH ONE?  And are you trying to install 2008 32-bit or 64-bit??

Keep in mind that before you boot to the Windows DVD, you MUST configure and initialize the RAID array FIRST.  This is done in CTRL-C for the SAS 6 or CTRL-R for the PERC's.

Alternatively, you can download and boot to the SMTD (Systems Management Tools and Documentation) DVD (follow the instructions for the download as it is a multi-part download that must be merged).  This will load all the drivers for you, even giving you the option of configuring RAID as part of the setup:

<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>

Since you didn't enter your Service Tag at the support site (which is good, because it is against forum policy to post it - sometimes makes our job harder :)), go back to the site, Enter your Service Tag, and on the left-hand side, click on Warranty Status, then change the tab to Original Configuration.  Post that here, or look for the RAID controller.

Alternatively, you can boot the server and watch information on the screen, looking for a PERC (PowerEdge RAID Controller), with a CTRL-R prompt, or a SAS 6/iR, with a CTRL-C prompt, to load.

Yes, it will.  It will also give you options to configure RAID during the setup. 

If you choose to install directly from the 2008 DVD, configuring RAID is very easy.  You simply enter at the CTRL-R prompt, hit F2 while highlighting the controller, then select your RAID level, select the drives to be part of the array (Space Bar or Insert), check the Advanced box, then the Initialize box, then OK.  You don't need to (and shouldn't) change anything else unless you know what you are doing.  Then use the following driver, as appropriate:

PERC 6 for 2008x64:

PERC 6 for 2008x86: