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4 drives vs 2 drives + RAID 1 or SYNC?

I found this, but it does not specifically answer my questions...

"RAID 1 comprises mirroring (without parity or striping). Data is written identically to two (or more) drives, thereby producing a "mirrored set". The read request is serviced by any of the drives containing the requested data. This can improve performance if data is read from the disk with the least seek latency and rotational latency. Conversely, write performance can be degraded because all drives must be updated; thus the write performance is determined by the slowest drive. The array continues to operate as long as at least one drive is functioning.[9]"

http://en.wikipedia.org/wiki/RAID#Standard_levels
 
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