My lab is considering setting up a server with an attached RAID device for storing our large imaging datasets. (probably a Mac Mini server with attached Promise SmartStor DAS w/ 4 1TB hard drives)
Since there will be 4 1 TB hard drives, I would like to set up a RAID 1 configuration where 2 of the drives (say, A and b), will be mirrored onto the other two (say, C and D).
Here are the questions:
1) Is my understanding of RAID 1 correct to do the above?
2) If, for instance, drive A fails, the mirrored drives will immediately take over, right?
3) When such a failure occurs (such as when A fails), will swapping it for a new empty hard drive (a new, drive E) be all that I need to do? That is, will the still functioning mirrors (C and D) automatically be used to rebuild the new drive (E)? Is this something I should set up in the server software?
4) Hypothetically speaking: suppose I disconnect one of the drives, say B, and connect it to a separate computer, add/remove a few files, plug it back into the RAID 1 group, will this screw things up?
Thank you very much!