4xSata Raid 0 Only 115mb/s??? Something wrong :(

[GESR]

I've got today a lanpaty nforce2 rev b. It uses a 3114 sata controler. Tried the raid sistem with a fresh windows install and with hdtach can only get around 115mb/s of read speed. the write speed is around 80mb/s

Sandra result:
http://pwp.netcabo.pt/kayle/raid/raid.JPG



HDTach result:
http://pwp.netcabo.pt/kayle/raid/hdtach.JPG



The results are very similar with 2xraid 0 with the same drives...
I'm using the latest dfi lanparty official bios and the latest sata silicon image drivers.

I can notice also something strange, the hdtach result isn't a curve... this was not expected... something is limiting the transfers

Does any one have any idea how i improve the results? Is any problem with the sata raid onboard controler?

Shouldn't i have better results? i was expecting around 150...?

Thanks




PS: i think here is the right place to ask this questions.

[FTC]

Hi,

Note that if your on-board RAID chip is linked to the PCI bus (and not directly to the southbridge) as I think most chips do (instead the Intel ones), then you are limited to max. PCI bandwith, which is normally of 133MB/sec... minus the interface overhead, 116 sounds about right...

Regards
FTC

[GESR]

Yup, its a silicon image 3114 sata onboard controler using the pci bus.

Is there any other controler that as 4 sata ports inside the chipset?

I've founded ich5r from intel and nforce3 from nvidia to amd 64 system but could only find motherboards with 2 ports, none with 4. Any one know a board that uses a chipset-integraded sata controler with 4 ports?


Can i do something to improve my results?


Thanks

[ajrettke]

even with the PCI bus limitation, your nearing the physical limit of the drives. What HDD's are you using? Even 4 raptors RAID 0 have trouble pushing beyond what you scored. RAID 0 with two drives is practicaly just as fast as a setup with even more drives. If you want faster performance you have to lay down the dough for SCSI 15k U320's...and then you need a 64bit PCI slot, or onboard SCSI controllers.

So for the lowdown....I think your setup has nothing wrong with it and is performing perfectly normal.

[Recursion]

God bless ICH5R

[GESR]

ajrettke, you are wrong. The fisical limit of this drives is way up, this is not the limit.
Im sure of this because the hdtach benchmark, you can see that is a staight line, not a curve as usual, this means that something is blocking the harddrives performance. The harddrives used are hitachi 80gb 7200Rpm sata drives.

I belive that this system can get about 160mb/s, i dont belive, i'm sure... i'm just mad with this pci controler...

[L337 M33P]

I belive that this system can get about 160mb/s, i dont belive, i'm sure... i'm just mad with this pci controler...

You hit the nail on the head there. PCI controller. Unless you get a workstation board with PCI-X 66/133 you aren't going to get more than ~120MB/s (or ICH5R)

[GESR]

But ICH5R or nforce3 Raid system (also integrated inside the chipset) have 4 ports? in witch motherboard? i didnt founded any :(

[L337 M33P]

But ICH5R or nforce3 Raid system (also integrated inside the chipset) have 4 ports? in witch motherboard? i didnt founded any :(

nForce 3 250 chipsets have 4 SATA ports, as do the 915/925 chipsets. These are not bound to the PCI bus.

[Xaotic]

The 915/925 has the ICH6R southbridge and as L337 M33P says, does support 4 SATA connections. Many of the boards that use the chipset are DDR2, so be careful when looking.

[theELVISCERATOR]

God bless ICH5R


yep...

2 raptors raid zero...


http://home.comcast.net/~eknop/raid.jpg