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Old Jan 26, 2014, 09:02 PM   #76
paulrbeers
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Quote:
Originally Posted by meddinstudios View Post
Curious as well. Couldn't we create a 4TB raid with 3 1TB 7200rpm drives (travelstars are $75/ea currently) and 1 1TB SSD with the SSD in bay 2,3 or 4? I think we'd see 600+ MB/s with that Hybrid configuration while staying within power restrictions. That combo shows much better savings vs 4 1TB SSD's.
What would be the point in your scenario? Any RAID is limited by the slowest drive. Thus, having 1 SSD with 3 Mechanical drives would be pointless. You might as well save $500 and just buy 4 Mechanical drives....

Remember, a RAID array will read from all drives simultaneously, thus if even one drive is slower than the rest then the entire array waits on that drive. In your scenario, the SSD will read it's "piece" faster than the rest, but won't be able to read its next "block" until the Mechanical drives complete their "pieces"....
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Old Jan 26, 2014, 10:10 PM   #77
hfg
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Perhaps the intent was to create a Fusion drive using a large SSD joined with the 3 hard disks in RAID-0?

However, if you look near the beginning of this thread, I posted results of using 4 HGST 1TB 7200rpm drives in RAID-0 which reached SSD speeds on DiskSpeedTest. It probably doesn't do quite so well with random small transfers however.

DiskSpeedTest RAID-0 Results:
config ....... Write / Read MB/s
1 disk ....... 115 / 129
2 disk ....... 250 / 258
3 disk ....... 345 / 375
4 disk ....... 501 / 507
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