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raid 0 or raid 5? - Page 2

post #11 of 19
Thread Starter 
which raid controller is good? im redoing my computer since one of my SSD failed in raid0. I am using OCZ agility 2 120gb.

Computer parts:

MSI Xpower bigbang mobo
i980x extreme cpu
2 gtx 580 vga
5 ssd

do you need any other info? i am not sure which raid controller to use. since im redoing everything
post #12 of 19
Quote:
Originally Posted by PeterUK View Post
CPU's today do this parity calculation in their sleep.

As long as you have write-back cache to handle Multiple I/O requests so that they may be grouped together to push more data on to the SSD's the speeds should be fine.

And with all that going on random write performance will still be better then five HDD's in RAID 5 with sequential writes at maybe getting upto 200MB/s thats random data and it maybe faster with Garbage Collection with five SSD's.
I have to disagree. Host-based RAID5's overhead kill write performance regardless of the CPU used. Compare the following RAID0 vs RAID5 write benchmarks:

8xIntel X25-M on 2xAdaptec 5805:




3x SandForce on ICH10R:



ACARD 9010 RAMDisk with 4 virtual disks:


Edited by DuckieHo - 1/24/11 at 11:24pm
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post #13 of 19
Quote:
Originally Posted by DuckieHo View Post
I have to disagree. Host-based RAID5's overhead kill write performance regardless of the CPU used. Compare the following RAID0 vs RAID5 write benchmarks:
Its one thing posting pic's its another thing on HOW and with WHAT settings they used.
http://www.mysqlperformanceblog.com/...gb-benchmarks/
Not one mention of write-back cache.
RAID 5 extreme!
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post #14 of 19
Quote:
Originally Posted by PeterUK View Post
Its one thing posting pic's its another thing on HOW and with WHAT settings they used.
http://www.mysqlperformanceblog.com/...gb-benchmarks/
Not one mention of write-back cache.
He does not mention not enabling WB cache either though...

Here's the link to the last set of values where it is explicit: http://www.legitreviews.com/article/1178/3/
Quote:
Cached writes were enabled on all controllers along with read-ahead when available.
RAID0 21K IOPs vs RAID5 8K IOPS
Edited by DuckieHo - 1/25/11 at 9:10am
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post #15 of 19
Quote:
Originally Posted by DuckieHo View Post
Here's the link to the last set of values where it is explicit: http://www.legitreviews.com/article/1178/3/

RAID0 21K IOPs vs RAID5 8K IOPS
For 4K random writes RAID 5 being that and RAID 0 being what it is yes...still damn fast and whats it got to do with SSD's being that they tested HDD's.
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post #16 of 19
There's a difference between Onboard raid and software raid/fakeraid, right?
Or does onboard raid also stress the CPU, not an onboard chip to do parity calculations?
    
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post #17 of 19
Quote:
Originally Posted by PeterUK View Post
For 4K random writes RAID 5 being that and RAID 0 being what it is yes...still damn fast and whats it got to do with SSD's being that they tested HDD's.

That was benchmarks using 4xDDR2 RAMDisks and 4x10K RPM Seagate Cheetahs..

He used two RAMDisk devices loaded with 4GB each. However, the RAMDisk allows two logical devices each. The test used 4xRAID of 2GB DDR2.

Quote:
Originally Posted by citruspers View Post
There's a difference between Onboard raid and software raid/fakeraid, right?
Or does onboard raid also stress the CPU, not an onboard chip to do parity calculations?
Software = virtual array created within an OS. It relies on system resources.
Host-based (onboard/fakeraid/firmraid) = a physical controller but creates array via internal software. It relies on system resources.
Hardware (discrete) = a physical controller with dedicated CPU and RAM.
Edited by DuckieHo - 1/25/11 at 10:58am
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post #18 of 19
Thread Starter 
so which raid controller should i install? sorry im very noob when it comes to raiding.
post #19 of 19
Quote:
Originally Posted by Skyy View Post
so which raid controller should i install? sorry im very noob when it comes to raiding.
Use the ICH10R... but it will bottleneck.
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