[jamsum]

I received a couple of helpful reply posts to my "Which RAID sys is best for dvd creation," thanks guys.
I got to thinking (sometimes a dangerous thing), ...in the various RAID systems for the home PC that one can build, just how critical are things like system disk read-write speeds when copying digital video input from a source like a Sony Handycam, Dig 8, which is what I have. I guess I could be over-thinking this
But this thought thread also got me to thinking about how this relates to other apps as well.

For instance, does a RAID 1 system load up the processor, the sys bus, or the memory by having to write to 2 disks? Or is my thinking a little off here. The main reason I am asking this is because I understand that video processing and dvd creation are very demanding applications that use up a lot of system resources.

Would RAID 0 offer any benefits for speed and read-write reliability in such apps? -and are RAIDs 0 and 5 comparable in benchmark considerations?

I haven't really much more info on these topics other than what I can find through basic search engines, which stears me towards very basic results.

[O111111O]

I know this is kind of an old post, but a VERY useful tool for testing read/write performance is IOZONE. (http://www.iozone.org/)

I recently ran into a performance issue with creating hundreds of thousands of RRD files with an EXT3 filesystem. This was running on the fastest/most expensive RAID1_0 stripe we could purchase.

IOZONE made it very easy to show empirical evidence comparing read/write by block size using different filesystems and RAID types. To make an extremely long story short, we used XFS from SGI code and used smaller block size. Performance ended up in the 200MEGABYTE per second transfer range based on 8-64K blocks, with 3-9usec seek times.