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PERC 5/i RAID Card: Tips and Benchmarks - Page 258

post #2571 of 7269
Quote:
Originally Posted by RobiNet View Post
but it also need to be 1Rx8 or 1Rx16 (?)
1GB dims with x8 chips are available, but I do not know if the firmware can use them.
An example http://www.valueram.com/datasheets/KVR400D2D8R3_1G.pdf

http://download.intel.com/design/iio...s/30543401.pdf
chapter 8.5
It looks like it supports x64 and x72 configurations

The processor specification update shows a minor problem with CL3 chips (http://download.intel.com/design/iio...t/30543511.pdf)

"Problem: For DDR-II memory with a CAS Latency (CL) of three, the memory controller unit (MCU) doesnot provide the proper timing for the On-Die Termination signals (ODT[1:0]). The JEDEC DDR-II
SDRAM Specification, September 2002 states that ODT must be driven one cycle prior to the write
command, but the MCU does not meet this timing.
Implication: CAS latency of three is not supported in the 80333; therefore, there is minimal performance impactas compared to CAS latency of four.
Workaround: Use CAS latency = 4 or do not use the ODT feature."


p.s.: I will try to find a 1GB DDR2 ECC 400MHz module and try it. Does anyone has one for sale?
Edited by sdim - 6/8/09 at 3:03am
post #2572 of 7269
Thread Starter 
Quote:
Originally Posted by sdim View Post
Max Supported Cache

The Perc 5/i has the IOP 333 processor.
From the IOP333 specifications ( http://download.intel.com/design/iio...f/30658301.pdf ):

"The IOP333 provides ultra-fast memory transactions due to
its DDR SDRAM dual-ported memory controller and supports
up to 2 GB of DDR 333 MHz memory or 1 GB of DDR2-400
MHz memory. Registered and unbuffered DDR 333 and
registered DDR2-400 DIMMs can be used with the IOP333."

Does anyone has a DDR-2 400 1GB available? If yes, can you try to use it?
I'm waiting for my Perc 5/i this week (with 512MB), but I don't have 1GB dimm to try it.
I believe 512MB is the max possible regardless of module.

Quote:
Originally Posted by dogchainx View Post
Right now my Perc 5i is topping out at 450mb/s with 4x120gb Vertex, so any drive beyond 2 is wasted performance (for the most part)
I believe someone here was able to hit over 600MB/s with the 5/i....

Quote:
Originally Posted by SSDaddict View Post
Hi,

I just registered and thought I'd share some SSD benchmarks with you.

I bought my Perc 6/i Adapter (256KB cache + BBU) from Dell about a month ago and have since tried to squeeze as much as possible out of it.

I promised some guys at the ocz forum to post a bench showing that the Perc can handle ~1GB/s throughput.

So, here it is.
HDTach 3.5 Benchmark max throughput at 8MB.
4 x Intel X25-M SSD's RAID-5, stripe size 64KB, No Read Ahead, Direct IO.

Attachment 111043

I'll be posting more benchmarks soon.
Woah... It looks like a PCIe bottleneck? I thought x8 PCIe was capable of 2GB/s?
Edited by DuckieHo - 6/8/09 at 7:40am
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post #2573 of 7269
Quote:
Originally Posted by DuckieHo View Post
Woah... It looks like a PCIe bottleneck? I thought x8 PCIe was capable of 2GB/s?
LOL, I'm quite pleased with it.

According to Dell
"Using 3Gb/s SAS technology, PERC 6 was observed in testing to be able to transfer up to 1484 MB—the theoretical upper limit by RAID On Chip (ROC) is better than 1.5 GB—using sequential reads and employing both of the external channels."

Link to document

I managed to get 1100 something using 5 SSD's (4 X25-M's + 1 X25-E) but the last one didn't scale like the others.
So, I believe I'm close to the limits of the 6/i Adapter. (the 6/E might be better?)

edit:
FYI, it maxed out at ~660MB/s in a PCIe x4 slot. (using 3 SSD's)
Edited by SSDaddict - 6/8/09 at 8:08am
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post #2574 of 7269
Thread Starter 
Quote:
Originally Posted by SSDaddict View Post
LOL, I'm quite pleased with it.

According to Dell
"Using 3Gb/s SAS technology, PERC 6 was observed in testing to be able to transfer up to 1484 MB—the theoretical upper limit by RAID On Chip (ROC) is better than 1.5 GB—using sequential reads and employing both of the external channels."

Link to document

I managed to get 1100 something using 5 SSD's (4 X25-M's + 1 X25-E) but the last one didn't scale like the others.
So, I believe I'm close to the limits of the 6/i Adapter. (the 6/E might be better?)
Time to get replace all your X25-M's with E's? Or maybe try testing with different sector sizes?

I believe the 6/i and 6/e use the same LSI 1078 ROC so their limits would be similiar. The 6/e just has replacable DDR2 and external ports.
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post #2575 of 7269
I have tested most stripe sizes (16KB-512KB) but I need to do some more tests as I have moved the 6/i to an X58 MB.
It looks like the performance is up a bit from the P45 chipset.

The X25-M perform a little better on reads actually, but the E is unbeatable on writes ;-)
(I've got 2 E's but 1 is in a webserver)
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post #2576 of 7269
Thread Starter 
Quote:
Originally Posted by SSDaddict View Post
I have tested most stripe sizes (16KB-512KB) but I need to do some more tests as I have moved the 6/i to an X58 MB.
It looks like the performance is up a bit from the P45 chipset.

The X25-M perform a little better on reads actually, but the E is unbeatable on writes ;-)
(I've got 2 E's but 1 is in a webserver)
I saw that you are using Direct IO... what happens when you use Cache IO?
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post #2577 of 7269
Will I have significant performance increases, with 3 SSD HDD's, if I do RAID 0 on a PERC 5/i (or 6/i), versus using my ICH10R on my MB?

What are the differences between the 5/i and 6/i? Significant performance increases?
    
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post #2578 of 7269
Thread Starter 
Read the OP.


Quote:
Originally Posted by ShadowFox19 View Post
Will I have significant performance increases, with 3 SSD HDD's, if I do RAID 0 on a PERC 5/i (or 6/i), versus using my ICH10R on my MB?
Here are my results.... RAID0 with more than 3 drives should benefit. The ICH9R and 10R perform about the same.
Quote:
Generalized Results
RAID0 write speeds went from 165MB/s to 180MB/s but less consistent.
RAID 0 read speed went from 162MB/s to 182MB/s and MUCH more consistent.


ICH9R RAID0 w/ Caching [128KB]


PERC RAID0 (Write-Back, Adaptive-Read-Ahead) [128KB]



Quote:
Originally Posted by ShadowFox19 View Post
What are the differences between the 5/i and 6/i? Significant performance increases?
Quote:
PERC 5/i vs 6/i Whitepaper: http://www.dell.com/Downloads/Global...0255-Dixit.pdf
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post #2579 of 7269
Quote:
Originally Posted by DuckieHo View Post
Read the OP.




Here are my results.... RAID0 with more than 3 drives should benefit. The ICH9R and 10R perform about the same.
Thanks, Duckie!
    
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post #2580 of 7269
Quote:
Originally Posted by DuckieHo View Post
I saw that you are using Direct IO... what happens when you use Cache IO?
I haven't noticed any difference on the SSD's yet, it might show up in IOmeter though.
I'll soon find out, I've started retesting now so it won't be long.
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