Originally posted by jaross
so umm. RAID 1 is the best read proformance?
RAID arrays aren't really about increasing performance. It's a solution in which you combined 2 or more inexpensive or independant discs to get a larger storage space.
You combined 2 or more inexpensive or independant discs to give you data security. Like RAID 1 or RAID 5. Example: Take (2) 200gig SATA HDD's and configure them in a RAID 1 Array, How much storage space do you think you'll have? 400gig right? WRONG.
You'll only have 200gig because RAID one is striping with parity. Which means all the data written to 1 disc is also written to the other disc as well. If 1 disc fails, guess what you have a duplexed disc to recover your DATA from. RAID 5 is like RAID 1 but you need to have 3 to 4 HDD's - Data is striped to 3 discs, while the 4th is striped with parity. You lose one drive. You can recover all your data. These solutions are very good for businesses and corporations as it provides data security.
RAID 0 which has become very popular in desktops is more or less used to combined 2 discs say 200gig & 200gig to give you 400gig in one drive letter. A little bit of data is striped to both drives. Sure both discs will be sharing the work load when it comes to accessing data but the performance isn't going to be mind blowing. Example I want to have a 500GIG hard drive. But, the price is ($360 - roughly) OR how about if I buy (2) 250GIG HDD's and RAID 0 them at ($115 each) So that's 500GIG for only ($230). That's ($130) less then the one drive. I could even buy another 250gig HDD and get 750GIG for $345 vs. 500GIG for $360. Get it?
Performance increase is very slight in RAID 0 and most noticably in I/O performance. Applications that require high bandwidth will show noticable performance increase. One of the largest factors in a performance increase of RAID 0 is the MOBO's chipset and controllers. Some increase performance, some don't. Google this, "RAID PERFORMANCE BENCHMARKS" you'll find plenty of articles that support what i'm saying.
I hope you have a better understanding now of all RAID ARRAYS.