fastloopattack

原帖由 pkhwong 於 2009-6-22 03:47 PM 發表
後加圖在 15版144#
大量有關ACARD的詳細測試在第18版, 175#, 今次圖片又大又清

Sorry, is there any page 15 or page 18?

回應讀者要求，加插:
AS SSD Benchmark測試: Sequential Read: 435.78MB/s; Sequential Write: 379.64MB/s; Score: 223
CrystalDiskMark測試: Sequential Read: 760.0MB/s; Sequential Write: 554.6MB/s
See the original test report at below hyerlink:
http://user.qzone.qq.com/1055908580?ptlang=2052

[ 本帖最後由 fastloopattack 於 2009-6-22 20:57 編輯 ]

chiushing01

回應各C hing讀者要求，加插:
AS SSD Benchmark測試: Sequential Read: 435.78MB/s; Sequential Write: 379.64MB/s; Score: 223 和CrystalDiskMark測試: Sequential Read: 760.0MB/s; Sequential Write: 554.6MB/s
期望Photofast G-Monster的測試

[ 本帖最後由 chiushing01 於 2009-6-23 08:26 編輯 ]

tyranid

原帖由 chiushing01 於 2009-6-22 23:54 發表
回應各C hing讀者要求，加插:
AS SSD Benchmark測試: Sequential Read: 435.78MB/s; Sequential Write: 379.64MB/s; Score: 223 和CrystalDiskMark測試: Sequential Read: 760.0MB/s; Sequential Write: 554.6MB/s

Problems of RAID controller?
Intel SSD is RAID0 might just faster than that

輕基黃

原帖由 tyranid 於 2009-6-23 02:13 發表

Problems of RAID controller?
Intel SSD is RAID0 might just faster than that

The Acard drives are in RAID5 array. The 3Ware AMCC RAID controller card is PCI-E x4.
I am not sure whether it is the Acard's memory controller limits the speed of DD2-RAM or the narrow brand width of PCI-E x4 or the limitation of SATA.

If we compare Acard drives with SSD, the benchmark of Acard drives achieve over 700MB/s in sequential read under CrystalDiscMark, it is really fast and satisfactory.
But ...if we compare Acard drives with DDR2-RAM speed, it is far from satisfactory, the speed of DD2-RAM should be much more faster. I think that the manufacturer of Acard should look into this matter, try to improve the speed in the next generation of products.

[ 本帖最後由 輕基黃 於 2009-6-23 10:03 編輯 ]

tyranid

原帖由 輕基黃 於 2009-6-23 09:41 發表

The Acard drives are in RAID5 array. The 3Ware AMCC RAID controller card is PCI-E x4.
I am not sure whether it is the Acard's memory controller limits the speed of DD2-RAM or the narrow brand width o ...

I am not talking about the bandwidth
I am the 4K read/write

輕基黃

原帖由 tyranid 於 2009-6-23 15:36 發表

I am not talking about the bandwidth
I am the 4K read/write

The results are very contradictory. The sequential read/write of Acard DDR2-RAM Drives are much more faster than OCZ SSD, but the 4K read/write are slower than OCZ SSD. Is there any possible explanations for such results?

tyranid

The raid controller is not good enough for SSD

and the sequential read/write of SSD is not slow in comparing with ACARD.....

fastloopattack

原帖由 tyranid 於 2009-6-23 10:37 PM 發表
The raid controller is not good enough for SSD

and the sequential read/write of SSD is not slow in comparing with ACARD.....

Is there any reason for you to say that the raid controller is not good enough for SSD?

The Sequential Read of ACARD is: 435.78MB/s which is nearly double your SSD which is only about 2xxMB/s, I think that ACARD sure win your slow SSD. But ACARD is a DDR2-RAM drive, the performance of ACARD should be compared with the speed of DDR2-RAM, therefore, I think that it is far from satisfactory, it is too slow.

tyranid

原帖由 fastloopattack 於 2009-6-23 23:42 發表

Is there any reason for you to say that the raid controller is not good enough for SSD?

The Sequential Read of ACARD is: 435.78MB/s which is nearly double your SSD which is only about 2xxMB/s, I thi ...

Wow, what a impressive 435.78MB/s sequential read by 3Ware RAID controller and 4x ACARD in RAID5. It is twice as fast as a single SSD in sequential read  , and almost 10 times slower than a single SSD at Random4K-64thrd write.
4 ACARD vs 1 SSD, i expected it is way faster than a single SSD, but i don't see that

K_C_

I am not going to start fighting with anybody, according to ACARD's spec, the max transfer rate is 400MB/s, but is that possible under a SATA 2.0 interface?

And when we are talking about "max transfer rate", that's usually talking about sequential transfer rate. When we look at 4KB read/write, then we may shift our attention to the IOPS instead. Once again, according to ACARD, the IOPS for 1 ACARD is about 20K (the spec didn't tell whether it is read or write IOPS).

ACARD spec can be found here: Link

For the same data for Intel SSD (X25-E):

Max read = 250MB/s, write = 170MB/s (so it loses to ACARD here).
4KB read IOPS = 35K, 4KB write IOPS = 3.3K

X25-E spec can be found here: Link
So I think the above told why X25-E got a faster 4KB read/write than ACARD.

Finally, I just want to tell, to get something over 1GB/s is not very surprising indeed. I got this months ago and just seems nobody talked about before. See below:



That was done with Adaptec 5805 + Intel X25-E x 2 only. So I don't see any superior results from the Photofast PCI-e SSD card indeed.

Just my $0.02.

[ 本帖最後由 K_C_ 於 2009-6-24 01:03 編輯 ]