Dårlig ytelse med SCSI RAID

[jornt]

Hei, lurer på om noen kan hjelpe meg litt, har problemer med dårlig ytelse med et Adaptec 2010 ZCR RAID kort. (Som benytter en Adaptec AIC-7902 onbard dual Ultra320 kontroller)

 

Får max 70-90 MB/sek med denne kontrolleren, mens de fire diskene jeg har burde klare 250-300 MB/sek i RAID 0 (andre jeg har snakket med har fått 270 MB/sek med nøyaktig samme disker, men på en 39320-R kontroller)

 

Resten av posten er på engelsk (har postet på et annet forum også )

 

I have two servers with this setup:

Supermicro SuperServer 6023P-8 (SUPER X5DP8-G2 motherboard)

2 x Xeon 2.66 GHz, 533 MHz FSB

2 x 512 MB Corsair ECC/REG PC2100 DDR RAM

4 x Seagate Cheetah 15K.3 18 GB drives

Adaptec 2010S Zero Channel RAID, located in the green slot

Windows 2000 Server, service pack 3

 

The 2010S is located in a 64-bit, 66 MHz slot, 528 MB/sec transfer rate. All drives are using Ultra320 transfer mode, and everything is properly terminated.

 

Performance results, ZD WinBench 99 Version 2.0:

http://www.skm.no/temp/raid

As you can see, four drives in a RAID 0 array only performs on par with a single drive! Even software RAID in Windows 2000 is outperforming the 2010S with about 50% in most tests

 

I have of course tested the servers in several configurations, but the transfer rate never exceed 80-90 MB/sec

 

I've tested on:

- Both of the two equally configured servers

- With or without the newest RAID BIOS or NVRAM flashed into the controllers (dated 2003-01-29)

- Windows 2000 Server without SP3

- Windows 2000 Server with SP3

- Windows XP

- With or without busmastering enabled

- With or without hyperthreading enabled

- Running Windows from the RAID array

- Running Windows from a separate drive

- RAID 0, 2 drives

- RAID 0, 4 drives

- RAID 10, 4 drives

- RAID 5, 4 drives

- Stripe sizes of 64 kb, 128 kb and 256 kb

- With or without caching enabled

 

I now begin to understand that the controller simply isn't able to transfer more than about 80 MB/sec, even if the specs says it should be able to transfer up to 640 MB/sec using both channels (Which is of course theoretical, but with lets say 10 drives in RAID 0 over both channels should make more than 500 MB/sec)

 

I consider "upgrading" to the 2120S, but I see several people complaining about the poor performing Adaptec cards - could anyone post their results on a 2010S, 2120S or 2200S? With for example 4-6 drives in RAID 0.. Does anyone achieve higher results than 80-100 MB/sec with these controllers?

 

What are your experiences with the 29320-R or 39320-R controllers?

Last question: is the 29320-R able to run 4 drives in a RAID 10 array?

 

- Jørn Tømmerås, frustrated computer engineer