If you haven't, using the built in NT Backup (ntbackup.exe) found in server 2003, running a scheduled backup to an external USB hard drive is better than nothing. Have you thought about backup? even with a RAID 5 setup you could still loose data if the controller dies, especially if you don't have a battery backup cache module installed in the RAID card.
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So it is better to use RAID 5 to ensure all you data is fault tolerant.
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#HP DL360 G6 DRIVERS DRIVERS#
Drivers for laptop HP ProLiant ML110 G6, the following page shows a menu of 23 devices compatible with the laptop model ProLiant ML110 G6, manufactured by HP.To download the necessary driver, select a device from the menu below that you need a driver for and follow the link to download. Using RAID 0 spanning data across all 3 drives give you no protection if 1 drive fails, where as using RAID 5 across 3 drives does, but you can only suffer 1 single drive loss in a RAID 5 set made up of 3x Drives. Server Installation HP ProLiant ML110 G6. I also agree with bluboy's previous answer where you already have fault tolerance using the 3x 146GB drives located in the server. Bringing an exchange system into an existing enterprise is no easy task so i understand why you'd want to keep all your hard work you've already done. Unfortunately you will loose all the data on the drive if you break and re-configure the RAID array controller, unless you use an imaging tool such as Symantec Ghost to save externally a snapshot of the data on the C Drive (Assuming the C Drive is the only partition you created) before you break down the RAID configuration.
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The ProLiant G6 range from HP will automatically choose the best RAID setup depending on the amount of hard drives it finds attached to the controller.