LSI MegaRAID 9260-4i + 2x Marvell based Plextor - poor performance?

[c22]

Hello guys,

I've got two LSI controllers on my desk 9260 and 9240. Decided to try 9260 first, but what concerns me is... I'm getting really poor speed compared to X79 chipset.

I'm using 2 plextor drives: M5S and M5Pro. I know they're not equally fast, but for benching will do just right.

Look at results vs Intel:



X79 is better at 4K writes and completely destroys my 9260 in terms of 4k-64Thrd.

Configuration:



Could you help me with this one? I can provide screenshots of anything you need

Regards

[mobilenvidia]

With the M5S and M5P on the LSI9260
In Device Manager, Disk Drives, then the array, then policies.
Check the 'writing Cache policy' setting, if enabled disable it, reboot then test again.
If disabled try enabling it.
If you can't change it here, then do it with LSI MSM utility.

Disabling seems to work best with SF based SSD's enabled seems to work better with some other SSD controllers.

[c22]

Can not.

"Windows could not change the write-caching setting for the device. Your device might not support this feature or changing the setting"

EDIT: changed in MSM utility, reboot and benching.




After setting "disk cache policy: disabled":

seq: +100 MB/s read, -600 MB/s write
4k: -2 MB/s, -15 MB/s
4k-64thrd: -20 MB/s, -50 MB/s

:/

[mobilenvidia]

Write speeds are terrible.

In MSM:
Writeback is 'Always on' ?
Have a play with Read ahead and Cached IO as well

[c22]

I tried almost every single configuration and nothing gives me speeds that I wanted to see

[Nizzen]

If you want speed with ssd's , buy lsi pci-e 3.0 series

[c22]

I doubt PCI-E 2.0 is any problem here :P It delivers solid 2 GB/s at x4 link so this is plenty, I just wanted to bump my random read/write speeds

[Nizzen]

I doubt PCI-E 2.0 is any problem here :P It delivers solid 2 GB/s at x4 link so this is plenty, I just wanted to bump my random read/write speeds

The controller is the problem.
Buy Areca 18xx series ir the new lsi pci-e 3.0 series for ssd speed.

Isn't youre controller pci-e 2.0 x 8 ? Same as ibm 1015?
And youre write back cache is not activated, that is for sure.

[joelz]

What stripe size was used on the LSI volume and on the Intel/X79 volume?

LSI documentation on benching.

[felix_w]

Well, my 2x 128GB Crucial M4 on the same controller with Fastpath gave the performance that follows....



NoReadAhead-WriteThrough-DirectIO-DiskCacheEnabled 128K stripe LSIFW-12120-0073 - 2120183-1415

I thinik you should secure erase and retest

EDIT :

This one is same settings but 105MHz PCI-E (and it's the same AMD setup with above)

[Nizzen]

Fastpath is helping the high QD.
Thredstarter need it...