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Perc 5/i poort performance?

B

BBA

Supreme [H]ardness
Joined
Apr 25, 2003
Messages
5,382
I just got one of these cards (minus battery) with 256 MB ram, decided to see if I can get my read/write speeds better than the ICH10 and even with WB forced on in the card, the PERC 5/I controllers write drive performance is about 1/2 of the straight ICH10 performance. I am not using the card for raid, just for the 6gb/s HBA.

Here is what I have:

Samsung 840 250GB SSD
XFX X58 Deluxe and i930

With SSD on ICH10:
275MB/s read
275MB/s write

With SSD on PERC 5/I
560MB/S read
150MB/s write

I guess I want to know if the card just has performance issues as I can't see spending $50 for a battery just to see. I have tried forcing WB through the PERC bios (using LSI fw) with no difference.

BTW: Does anyone have a schematic of the Perc 5/I battery and battery cable?
 
without a battery you cant go into write through mode. they are slow in write back mode
 
For good write performance in raid you need to be in write back mode. Not write through. However if you are in HBA / JBOD mode I do not believe the cache plays a large role.
 
drescherjm said:
For good write performance in raid you need to be in write back mode. Not write through. However if you are in HBA / JBOD mode I do not believe the cache plays a large role.
Click to expand...

I agree, and I did try forcing WB with no difference, so taking cache out of the picture, why would straight HBA configuration reduce performance over the built in controller?

Maybe this is not really a good fit since I do not plan on running raid with the SSD.
 
It's extremely well-known that you should either use Intel ICH or newer LSI stuff 9210 or better for SSDs... Failure of research, unfortunately. You might make them perform decent, but no matter what options you enable, that card is not going to outperform Intel.
 
BBA said:
I agree, and I did try forcing WB with no difference, so taking cache out of the picture, why would straight HBA configuration reduce performance over the built in controller?
Click to expand...

I believe they disabled the "force write back" many firmware versions ago. (3+ years)

You can check the box in the setup but it won't actually do anything.

If you do buy a battery, stay away from the e-bay. I have gotten 2x defective ones from the over the years.
 
dandragonrage said:
It's extremely well-known that you should either use Intel ICH or newer LSI stuff 9210 or better for SSDs... Failure of research, unfortunately. You might make them perform decent, but no matter what options you enable, that card is not going to outperform Intel.
Click to expand...

What are you talking about? It's extremely well known that hardware controllers with cache perform better than software controllers. I'm just not using them for raid, was hoping to get write cache working for single drive, that's all.

Besides, it was a spare card a friend had laying around not being used, so no cost involved, just an experiment.
 
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