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JamieToner deserves 150points for his reply, but my own solution, through Dell tech support, was the definitive answer.
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I have a 2850. Two drives (0 &amp;&nbsp;1) were supposed to be in a RAID1(mirroring) situation. &nbsp;The other 3 are RAID5 and another (5) is a hot spare.<br />
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For DR purposes I wanted to take another drive, and replace 0 or 1 with it and rebuild the mirror, then store that drive in a vault and put the original back in. That way, theoretically if all went south for drives 0 and/or 1, I could just put the drive in the vault and a new drive into 0 and 1 and tell it to rebuild the other and be back in business.<br />
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When I went to test things, I pull Drive 0 out. &nbsp;After a while the machine crashed with a blue screen--even though I thought it was supposed to be hot swappable. &nbsp;When I booted back up in to the RAID config, drive 0 and 5 said FAILED. &nbsp;I did a Force Online for Drive 0 and rebooted. &nbsp;Assuming the RAID1 never was working for 0 &amp;&nbsp;1 I decided to rebuild that. &nbsp;I am unclear how to do it. &nbsp;I cleared the data on Drive1. &nbsp;What do I do get drive 0 to mirror to drive1 without destroying data on drive0? &nbsp;Shouldn't I be able to remove drive 0 at that point and everything still work?<br />
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Thanks<br />

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I have a 2850. Two drives (0 & 1) were supposed to be in a RAID1(mirroring) situation.  The other 3 are RAID5 and another (5) is a hot spare.

For DR purposes I wanted to take another drive, and replace 0 or 1 with it and rebuild the mirror, then store that drive in a vault and put the original back in. That way, theoretically if all went south for drives 0 and/or 1, I could just put the drive in the vault and a new drive into 0 and 1 and tell it to rebuild the other and be back in business.

When I went to test things, I pull Drive 0 out.  After a while the machine crashed with a blue screen--even though I thought it was supposed to be hot swappable.  When I booted back up in to the RAID config, drive 0 and 5 said FAILED.  I did a Force Online for Drive 0 and rebooted.  Assuming the RAID1 never was working for 0 & 1 I decided to rebuild that.  I am unclear how to do it.  I cleared the data on Drive1.  What do I do get drive 0 to mirror to drive1 without destroying data on drive0?  Shouldn't I be able to remove drive 0 at that point and everything still work?

Thanks


Help with RAID1 on PowerEdge 2850

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

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.