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What is raid, What does it do ? do i need it ? - Page 2

post #11 of 13
Quote:
Originally Posted by DrC View Post
This is very interesting stuff to learn here. So here's a dumb question about Raid 0. If you can get faster performance with two drives, why not four drives to alternate the data?

You can run a RAID0 with 4 drives.

However, there is increase risk because if any drive fails, you lose everything.

Note, that RAID0 provides better sequential performance. It provides little random performance (for low queue depths) and it may increase latency slightly.
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post #12 of 13
oh, oops. Hey, I'm new at this...so why not 8? So you're saying the improvement is only slight?
post #13 of 13
Quote:
Originally Posted by DrC View Post
oh, oops. Hey, I'm new at this...so why not 8? So you're saying the improvement is only slight?
It depends on implementation and the quality of the controllers, but generally RAID 0 scaling is around 90-95% of theoretical, depending on the storage units used.

Hard drives suffer more from latency issues than SSDs do, so I assume SSDs will scale better. Additionally there is the latency in simply having to address an increasing number of drives - there comes a point when that latency begins to have an impact on performance.

Finally, as Duckie said, the main benefit of RAID 0 is sequential transfers. This is most noticeable when working with bulk data such as video files and DVD ISOs. Random access performance is not improved by RAID 0. In fact I don't think there is a RAID level that improves the random access performance - such performance is a property of the storage units themselves, not their configuration.
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