Taedrin
Gallente
Golden Mechanization Protectorate
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Posted - 2009.03.18 20:06:00 -
[1]
 Originally by: KingsGambit
It really depends on what you're after, performance or redundancy. A Raid 0 (striped) array offers the biggest performance boost of all RAID types but halves your redundancy (assuming 2 hard drives). A Raid 1 (mirrored) array offers no performance boost at all but gives you the most redundancy of any other RAID type (double in the case of two drives).
Personally, I don't know why you would have 6 hard drives in a PC. As well as power usage, heat/noise and physical space in the case, it's a lot of management when you can get hard drives now 1TB alone. If it were me, I would prob mirror the 2x 500GB drives for use on that machine, which means in the case of a faulty HDD, I can still run off the other. I would put the 4x 250GB drives into a PC or NAS supporting RAID5, which would give approx 700-720GB usable space (after formatting and RAID 5) as a network file store (eg music, videos, photos, etc). RAID5 offers a great trade off between performance increase and redundancy (though not as significantly as 0 or 1 respectively).
With RAID5, you can actually continue accessing your data even if one drive in the array goes down, albeit slower (the controller has to calculate the missing data on-the-fly) and when you get a replacement, can simply add it to the array in place of the faulty one and it gets rebuilt. If 2 drives both go down at the same time, or ANY drive in a striped array, you will lose all the data.
Incorrect. RAID 0 is simple data striping and has NO redundancy AT ALL. It has improved read AND write performance. There is no backup.
RAID 1 CAN have a significant performance boost to read operations, as both disk have the same data available to them. There is nothing stopping the RAID array from utilizing both disks for the read operation. However, there is no performance boost to write operations.
RAID 5 has improved read performance, but a significantly decreased write performance. This is because the RAID array has to write parity information, which takes extra time. However, parity information can be ignored during a read operation, so read operations are actually faster than RAID 0, since RAID 5 needs an extra drive in the array (and since parity information is staggered across the drives).
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