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Will RAID 0+1 be faster than RAID 1?

I

InorganicMatter

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Oct 19, 2004
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I've got a RAID 1 array. It's slower than Christmas. I need more speed, but the simplistic redundancy of RAID 1. Will a RAID 0+1 get me better speeds while maintaining a decent ammount of fault-tolerance?
 
RAID 1+0 is supposed to be the better choice, at least from everything I've read (I don't run RAID, so I don't have real experience).
 
It really depends on the controller, some support reading from both discs simultaneously in a raid 1 array. But it definately won't improve your write performance.
 
RAID 1+0 is better, but not necessarily faster.

What is your setup? What kind of disks? How many? What controller are you using? How is the data being accessed, and what kind of data is it?
 
The setup is four 80GB Hitachi SATA disks, 8MB of cache, 7200RPM. The controller is the Intel ICH7R Matrix RAID controller.

I am looking for increased write speeds, unfortunately. :(
 
RAID 10 or 0+1 will give you a higher STR in theory. If you are saying that your RAID-1 is slow, it could be that your controller is not good at handling RAID-1 (I do not know). Whether RAID 10/0+1 will increase the performance for your application depends on this application's disk access patterns.

Here's some background info:
RAID 10/01
RAID 1

Performance of R1:
Random Read Performance: Good. Better than a single drive but worse than many other RAID levels.
Random Write Performance: Good. Worse than a single drive, but better than many other RAID levels.
Sequential Read Performance: Fair; about the same as a single drive.
Sequential Write Performance: Good; again, better than many other RAID levels.

Performance of RAID 10/01:
Random Read Performance: Very good to excellent.
Random Write Performance: Good to very good.
Sequential Read Performance: Very good to excellent.
Sequential Write Performance: Good to very good.
 
0+1/10 (whichever variant your controller supports) is your only choice for providing fault tolerance and increasing write throughput. If that doesn't get it done with your existing hardware, it's time to start looking at a real RAID controller (HighPoint, Areca, etc)

Fast, Cheap, Reliable. Pick 2.
 
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