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What is the performance diffenerce between a basic disk configuration and a RAID 1 configuration?

Posted on 2011-09-27
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What is the performance diffenerce between a basic disk configuration and a RAID 1 configuration?
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Question by:harris3563
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by:akhalighi
ID: 36710365
you will write to two disks instead of one , so writing takes a bit more , Reading is the same as single drive.
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by:akhalighi
akhalighi earned 250 total points
ID: 36710376
You won't get a better performance but you get fault tolerance , if one drive fails you have an identical drive that can take place and keeps server up and running.
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by:garycase
ID: 36710459
With most controllers you WILL get a performance boost with reads, as the system can support two simultaneous reads as long as no errors are encountered.     Writes are essentially at the same speed as a single drive, although there can be a small additional delay when doing multiple writes if you're using an unbuffered RAID controller.

Bottom line:   Effectively no difference with writes;  improved speed with reads;  and of course you gain the fault tolerance benefit of no data loss if one of the drives fails.
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by:akhalighi
ID: 36716926
I don't think Harris question involves hardware raid , it looks like he is looking into basic disk /dynamic disk differences , looks like he talks about software raid within windows.
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garycase earned 250 total points
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Even with integrated RAID controllers, there's still a notable increase in read performance, since multiple reads can occur simultaneously (2 with a 2-disk RAID-1).     Without a buffered hardware controller, however, it's true that writes will have a slight penalty (as I already noted).
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