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If you want to add more than 2 drives I would go with Raid 5 with a hot spare. &nbsp;Most reliable and efficient<br />
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<a href="http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/" rel="ugc">http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/</a>
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If you are looking at Dell, yes, this is possible ... you can have multiple arrays on the controller/server. A single RAID 1 can only have two drives, so you would have two RAID 1's.
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I agree with you PowerEdgeTech As I don’t see a need for raid 5, but Dell has no option of 2 raid 1. I see there I a<a href="http://www.thegeekstuff.com/2012/03/dell-server-perc-h700-create-raid/" rel="ugc">workaround</a> also I see a option raid 1/unconfigured raid, which I am not sure what it stands for. &nbsp;I would say &nbsp;<a href="http://onedrive.live.com/redir?resid=801F37823B3A243F!282&authkey=!AGpfTC1UYSXazIU&ithint=file%2cdocx" rel="ugc nofollow">RAID 0+1 </a> is what I am looking for but I don’t see such a option
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Just add two further disks and make a separate RAID 1 array for those.
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I agree with PowerEdge - Go Raid 10 - you would need atleast 4 hardrives.
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Rindi - Its exactly what he wants.<br />
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He is looking for 2 raid 1 arrays to split OS and data for performance.<br />
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Raid 10 gives much better redundancy and performance than 2 Raid 1 sets. After the array is created he can just partition the volume for OS and Data,
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I'm in the process of putting together a new server
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If you are in the process of building a new server, then know you can do whatever you want regardless of the options you are presented with the online configurator.
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Is RAID 10 accomplishing the purpose? With RAID 10 the operating system and date work on the same drives (longingly) even if its fiscal two drives, versus two Raid 1 the two hard drives work independently<br />
Also RAID 10 has a down side. If one of the hard drives fail, the other is worthless as it only has half of the information versus two Raid 1 which only the defected one needs to be replaced.
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according to dall recommendation a 7xx controller is only needed with a RAID 5
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As long as you are considering RAID, I would recommend the H7x0 controller regardless of your desired configuration.
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<div class="content wysiwyg-content">
My server is hardware based RAID 1 configured <br />
I want to add a hard drive so I can split the operating system and date on two physical hard drives which in general increases performance when thy are not on the same physical Drive. Is this possible in a RAID 1 environment? (having the server writing to two drives &nbsp;and on for mirror? I notice when I configure a server at dell online if I select RAID 1 it will not allow to add more than 2 drives)
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My server is hardware based RAID 1 configured 
I want to add a hard drive so I can split the operating system and date on two physical hard drives which in general increases performance when thy are not on the same physical Drive. Is this possible in a RAID 1 environment? (having the server writing to two drives  and on for mirror? I notice when I configure a server at dell online if I select RAID 1 it will not allow to add more than 2 drives)

Server RAID environment

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Hyper-V is a native hypervisor; it can create virtual machines on x86-64 systems and supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks. Hyper-V Server supports remote access via Remote Desktop Connection. Administration and configuration of the host OS and the guest virtual machines is generally done over the network.

Hyper-V

Since 1984, Dell has been delivering technology to fit your life.
Dell is in Enterprise, Home Office and Consumer sectors of the market, supplying a broad range of customizable desktops, laptops, notebooks, servers, storage, and network devices.

Dell

RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance. 

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.