horrible scsi performance............................PLEASE HELP!!!!!!!!!!!!!!!!!

[derekb77]

im having a horrible time with building my scsi based sytem. im not getting the performance that i thought i would.


here is my system:
ka7
800mhz athlon
128mb memory
scsi 18 gb fujitsu drive 10,000rpm
scsi pioneer 6x32x dvd-303s
scsi yamaha 8x4x24 cd-rw
adaptec scsi controller 29160
3d prophet II

i have two problems and i think theyre both related to my setup:

1. the first problem is that im getting a buffer underrun error when burning cds. it happens when i burn from the hd to the cd-rw. i am trying to burn at 8x to my yamaha 8x4x24. i have an 80 pin 10k drive that i have hooked up to the LVD 68pin scsi connector on my adaptec-29160 card. the transfer rate is supposed to be 80mb/s.

i also get the buffer underrun error when i burn disk to disk. my source drive is a pioneer dvd-303s which should be able to support an extraction rate to burn at 8x because ive seen numerous places on the web stating that it can be done.

2. second when i run the sandra benchmarking utility to test my scsi hd, the performance is terrible. my drive is an 18 gb scsi 10,000 rpm drive so it should be performing better.

how can i trouble shoot this problem so i can get optimal performance from everything? is there a way to check whether or not i am running optimally? my scsi hd is my mane drive and this is where my system boots from.


i also have two 5400 rpm IDE harddrives for storage. hooked up to the IDE 1 controler. one is the primary master and one is the primary slave. (i think the problem could be here too.)

more detailed sys temconfigiuration

i am running windows 98se. my fujitsu drive is connected to the lvd interface on the 29160 controller. it has the the "0" scsi assignment. i have my two disk drives daisy chained from the regular (50 pin) scsi on the controller, with the pioneer dvd drive being the farthest on the chain. the yamaha drive is given the "1" scsi assignmnet and the pioneer drive is given the "2" scsi assignment. i did not assign any of the scsi assignmnets myself, it automatically detected them in tha way. the adaptec 29160 controller is in the third pci slot. i have the latest drivers from the adaptec website loaded. originally i had the controller in slot one but had to move it cause it was interfering with my video card. also i have my bios set up to boot off of the scsi. the IDE drives i have are connected to the 1st IDE channel on the motherboard. they are daisy chained and one is primary master and one is primary slave. can you please help!!! im stuck and dont know how to optimize my setup. thanks

 

[compuwiz1]

The only thing that really sticks out with me is termination. You have an LVD drive, but is the 68 to 80 pin adapter you have LVD compatible? Does it have built in termination? Proper LVD cable should have it's own terminator, so you need an adapter without termination, or take the terminator off the adapter, if possible. I was having some of those same problems until I figured that out. Now if you have the Pioneer 303s, I believe it is at ID2 by default and not Terminated. So in that case terminate the Yamaha. The jumpering instructions that come with the Pioneer are about as clear as mud. Good luck!

 

[derekb77]

thanks for the help, i solved my problems. i was trying to get the drive to initialize at 80 and i finally did. i thnk the problem was the cable. i wasnt able to use a scsi-3 cable but an lvd cable did work. thanks again. my system is now blazin!