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RAID 01 and RAID 10 using the same controller, possible?

post #1 of 10
Thread Starter 
Hi all,

I wish to have a database server with separate drives for OS on RAID 01 and separate data drives on RAID 10. I was looking at the Dell PowerEdge r510 and it didn't seem to support this on the customizations page. Is this a good idea to have mix RAID configs by the same controller? Or is it a better option to go for two RAID controllers?

Thanks!
post #2 of 10
Well, if it's any help at all, I have a Dell PowerEdge 1900 with a PERC 5/i RAID controller and 6 250GB drives. When I bought the system, the sales rep told me that I couldn't order the system with multiple RAID schemes already configured, so it came set for RAID 5.

Since then however, I've re-configured it so that the OS sits on a RAID 1 array, and the data drives are arranged as RAID 10. So yes, the controllers (depends on which ones) do support multiple configurations per controller. You don't need separate controllers - however, depending on how busy your database will be, separate controllers might be worth having anyway.

EDIT:

Why do you want RAID 0+1?
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post #3 of 10
Thread Starter 
Thanks parityboy! Actually I meant RAID 1. It is for the OS. RAID 10 is for the data disks...
post #4 of 10
Isn't RAID 0+1 or RAID 10 the same??? Just another way of calling it???

And yes you can build multiple RAID Arrays on 1 controller.

I had 2 Raptors in RAID 0 (OS) and 4 Spinpoints in RAID 0+1 (DATA) once...
   
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post #5 of 10
Quote:
Originally Posted by audioslave View Post

Thanks parityboy! Actually I meant RAID 1. It is for the OS. RAID 10 is for the data disks...
Yes, virtually all controllers support multiple arrays.


How many data disks? RAID5 and RAID6 become more viable options as the disk count increases.

Quote:
Originally Posted by ASUSfreak View Post

Isn't RAID 0+1 or RAID 10 the same??? Just another way of calling it???
And yes you can build multiple RAID Arrays on 1 controller.
I had 2 Raptors in RAID 0 (OS) and 4 Spinpoints in RAID 0+1 (DATA) once...
No.... RAID10 is stripe of mirrors while RAID01 is mirror of stripes. They both provide the same disk space and performance.... BUT RAID10 is slightly more fault tolerant. RAID01 can only survive 1 disk failure since it mirrors two RAID0. RAID10 can survive multiple disk failures IF the failures are on different mirrors. RAID10 is a seperate mirrors in RAID0... so each seperate mirror can have a single failure.

RAID0+1 is pretty pointless and not that often support since RAID10 is better.
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post #6 of 10
@DuckieHo

RAID 5 or 6 for a database server? Really? All of my instincts say that configuration is a bad idea...
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post #7 of 10
Quote:
Originally Posted by parityboy View Post

@DuckieHo

RAID 5 or 6 for a database server? Really? All of my instincts say that configuration is a bad idea...



I'd say RAID 5 or 6 so you don't lose that much space..
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post #8 of 10
er..I know this is possible..I have done this...2 drives RAID 0..4 in RAID 10..With AMD i think, even.
 
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post #9 of 10
Quote:
Originally Posted by parityboy View Post

@DuckieHo
RAID 5 or 6 for a database server? Really? All of my instincts say that configuration is a bad idea...

For large storage needs, yeah.... RAID10 does not scale cheaply. Hardware controllers or even very good software ones can mitigate performance impact of parity calcs.
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post #10 of 10
Quote:
Originally Posted by DuckieHo View Post

No.... RAID10 is stripe of mirrors while RAID01 is mirror of stripes. They both provide the same disk space and performance.... BUT RAID10 is slightly more fault tolerant. RAID01 can only survive 1 disk failure since it mirrors two RAID0. RAID10 can survive multiple disk failures IF the failures are on different mirrors. RAID10 is a seperate mirrors in RAID0... so each seperate mirror can have a single failure.
RAID0+1 is pretty pointless and not that often support since RAID10 is better.

Clear! thumb.gif
   
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