2 x RAID 0 vs 6 x RAID 5

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EnderW

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Which would have faster read/write speeds?
2 x RAID 0 VelociRapter
or
6 x RAID 5 Western Digital Green Power 1 TB

controller would be Highpoint 3520
 
You should see better write times with the RAID 0 and better read with the RAID 5.
 
Maximus825 said:
You should see better write times with the RAID 0 and better read with the RAID 5.
Click to expand...

The raid 5 speeds are entirely decided by your controller. If it is a software raid 5 the read may not be faster. I've seen terrible reads from raid 5 on software raid.
 
thebeephaha said:
The raid 5 speeds are entirely decided by your controller. If it is a software raid 5 the read may not be faster. I've seen terrible reads from raid 5 on software raid.
Click to expand...
I know, that's why I would be using one of the fastest controllers available.
 
i would think read speeds would be faster with Raid 0 over raid 5 ?- writes slower, raid 5 as said depends on controller, and how many drivers

raid 6 is slower then 5 on writes sincew it has double parity
 
Sequential? Almost certainly the 1TB disks - they're a good deal slower, but there's 6 of them. If the controller keeps up, the 1tb disks will probably push an average of 60 MB/s each, and you get N-1 of those for a total of 300 MB/s. The Velociraptors are more like 100 MB/s, but you only have two.

What about raid 0+1 or faster disks? The GPs are low on power draw, but they're slow. If speed is your goal I'd look elsewhere.
 
Also, the GP drives are bad for raid unless you get the raid edition and even then I think some people here said don't use them for raid. (Ockie?)
 
These are my Real life numbers with 4xWD1000FYPS
I have the 8 drive setup almost done...
I have HD-Tune and HD tach ones aswell. If anyone wants to see I'll post them. Just say so.

Raid0
raid0kc0.jpg


Raid5
raid5vx5.jpg


Tests done localy: Raptor 150GB on onboard, Raid5 on 3ware 9650SE controller with BBU installed.
Remember these drives are slower than regullar 7200rpm but these could give you some idea on differences in performance.
Writes were capped to 83.5MB/s because I did those test locally on the PC by using 1xADFD 150GB raptor for reading files to be written to the array
 
MrGuvernment said:
raid 6 is slower then 5 on writes sincew it has double parity
Click to expand...

well yeah, but depending on the controller, that difference can be very small... if the xor processor can keep up, raid6 has the same mechanical restraints as raid5..
 
EnderW said:
Which would have faster read/write speeds?
2 x RAID 0 VelociRapter
or
6 x RAID 5 Western Digital Green Power 1 TB

controller would be Highpoint 3520
Click to expand...

this seems like a very odd comparison....

one give you an avertised size of 5TB the other 600GB.... my guess is that the the 5TB array would have faster read speeds, and the 600GB array would have faster write speeds... but this could change depending on how good the cache is on the highpoint cards (am not familiar with them)...

the 5400rpm speed does slow down the 1TB drives, however this is counter-balanced by massive platter sizes.. so dont let the 5400rpm throw you around too much..

just get the 5TB array... if you need to do video editing or whatnot that requires such fast speeds (gaming certaintly doesn't).. do what I do and jam a whole bunch of ram in there, say 8-16GiB, setup a big ramdisk and use that to demux your streams to... then write speed is so not an issue anymore... then encode from the ramdisk to the 5TB array.. compressed video makes write speed irrelevant again..

get an areca raid card ;) i have an Areca ARC-1220 pcie... it seriously stomps loud!!!

also get the WD GP RE2 drives..
 
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