<< ergeorge
I WOULD LOVE TO KNOW HOW U GET 2x the read speed on a raid 1. Cause raid 1 would be about the same speed as one drive. RAID 0 tho would increase performance 😛 >>
(from questionsandanswers)
If you have a good RAID controller, it splits up the reads over the available drives. So it might read half of the data from drive 1 and the other half from drive 2, in parallel. The software based controllers don't do very well at this, but the 3ware card scales almost linearly in reading with the number drives in a RAID 1 array. But don't listen to me, look at the benchmarks yourself:
From the database @ storagereview.com
IOMeter - File Server Access Pattern - Load = Moderate *
IOMeter Tests
IO/sec
MB/sec
Response Time
CPU Util.
IO/CPU%
3Ware Escalade 6400, 1 Drive
84.57
0.91
756.63 ms
0.91 %
92.93
3Ware Escalade 6400, RAID 1, 2 Drives
135.37
1.47
472.43 ms
1.51 %
89.65
You're not going to see a the full impact of the read speed-up because the benchmark is more complicated then a simple sequential read. Even so, the RAID 1 throughput is about 62% faster then the single drive metric, and the seek time is about 38% better.
I ran some benchmarks when I was setting up my system. One of my models reads about a few MB of data out of a large (about 30MB file) when it starts up. This portion of the program completed about 90% faster on RAID 1 then on a single disk. The RAID 0 mark was about 95% faster then single disk.
<< LOL... he probably doesn't know what RAID is. If anything RAID 1 is slightly slower than a single drive. >>
(from tazdev1)
Are you sure you know what RAID is? The fact that RAID 1 can speed up read access is pretty common knowledge. It will be about the same, to slightly slower then single disk for write access.
<< If 3ware got those kinds of results... it would be the most popular controller in the market and they wouldn't stop making them. >>
(from tazdev1)
Check out the database @ storagereview. They have very extensive result sets for this stuff. And yes, I have a hard time believing they weren't the most popular controllers out there. In addition to the performance, the setup & tools for their product were excellent. I don't know about the tech support, because I've never had any trouble with mine.
There marketing sucks for one thing though. Almost nobody has heard of them, even Anandtech ignored 3ware in their IDE raid shootout.