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raiding again?

S

samsung.204b

Limp Gawd
Joined
Aug 6, 2006
Messages
180
i just recently got a 300gb harddrive. a 7200rpm eide interface 16mb cache. (the interface is because i forgot to check before buying and i don't feel like changing it back, works fine)

my question, how much %age would i gain buying 2, 10000rpm, raptors running on raid 0?

more technical question, what if i got 3 drives? and would it be faster if i made a raid 1 or 5?
 
raid 0 you may notice a little bit increase, but maybe not. as far as raid 1 or 5, they are not made for spead, but for uptime (not backup)
 
You'd see more increase going from a 7200rpm drive to a single raptor than you would going from one raptor to two.

 
RAID-5 will likely see a write performance decrease, especially without a good controller.
 
can i ask you guys a personal question. what's the point on raid if it does not increase performance a lot, complete waste?

am i better buying a single 150gb raptor?
 
striping increases throughput, but usually decreases performance of caching strategy.

Typically you find like or no increase in application performance, like gaming or office document work. However if it is a task where linear throughput is key then striping will help that. Examples of that would be loading a level in a game so you can start playing faster, or transfering files, perhaps zipping or unzipping (unless you use highest archiving compression which would be processing limited). One other neglected benefit is page file performance, but the reason this is uaully neglected is because if you goal was memory performance, why not spend the money on memory.
 
samsung.204b said:
can i ask you guys a personal question. what's the point on raid if it does not increase performance a lot, complete waste?

am i better buying a single 150gb raptor?
Click to expand...

hmm...that's pretty personal...but I'll open up.
;)

RAID is best for redundancy.

RAID 0 can show some definite performance improvements, but only in very specific areas. The improvements in gaming and general computing are usually pretty small, while some database type applications can show huge gains. The biggest problem with RAID 0 is if you loose one drive, you WILL loose all of the data stored in that array. If you want the last bit of speed you can get, then RAID 0 may help, but don't expect it to work a miracle.

RAID 5 offers a good compromise between speed and redundancy. It is never as fast as RAID 0, but it allows any one drive to fail without loosing the whole thing. The hard part is that cheap RAID 5 cards use the CPU to compute the parity information, which can be a real pain if the application you're using is processor intensive and it slows down every time you read or write to the array. On the other hand, RAID 5 cards that have a processor just for calculating parity can be very expensive (the RAID card I have in my storage server retails for $500 ).

If you want a solid increase in HD speed, I'd consider the 150GB 10,000prm Raptor, and skip RAID altogether.

I hope this helps
 
samsung.204b said:
can i ask you guys a personal question. what's the point on raid if it does not increase performance a lot, complete waste?

am i better buying a single 150gb raptor?
Click to expand...
well, certain applications benefit greatly from RAID, just not most desktop apps. For example, Mikeblas runs a RAID-0 array for his database.
 
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