Intel ICH9R vs JMicron Raid 1 test

[barbaroja9]

Hi fellas,

Hdd Tach Results Intel vs Jmicron
Blue is Jmicron. Red is intel. Board is a P35C-DS3R v1.1. Hard disks are two samsung HD501LJ 500GB SataII.


Is the burst speed important? I even see less dips in the Jmicron controller. Another thing: The intel "veryfies and repairs" with a high frequency, making the system very slow.

I read the Jmicron is linked directly to the PCI-E bus. Maybe that makes up for some gains.

Anyone knows about the "split seek" feature in these controllers?
¿Any word about the results?

Thanks

 

[MyLeftNut]

Interesting results. I had always thought that the Intel onboard raid usually performed better than the JMicrons. Are you using updated intel drivers?

 

[barbaroja9]

Yeh, I am using the latest from both manufacturers. Any thoughts?

 

[barbaroja9]

lil bump

 

[footballrunner800]

This might be a good idea for someone else to check. IF this holds to be true, i might have to switch my raid drives to the jmicron controller.

 

[barbaroja9]

Hey. Not so fast: I did a thorough search and found that the feature "enable write back cache" increases burst speed. I had to check it:

Comparison Jmicron (Blue) vs Intel Write Back Cache Enabled (Red)

Holy cow!!!

Comments? Any thoughts about the dips in the intel?

 

[footballrunner800]

Heres a run with the ich9


Image

Theres some dips that up to today, i accounted it to one of the drives being faulty at that spot.

 

[barbaroja9]

Why do people always reccomend using an UPS if your going to use the write cabk cache?

 

[footballrunner800]

If a power faliure occurs while you have write back cache enabled, data corruption may happen if the data on the disk cache has not been flushed out to the disk media

 

[barbaroja9]

I see. Is that cache a big amount of data?