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erratic scsi speeds

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by njaneardude-30601088

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SCSI Guru's please help : )

The equipment:

ASUS P3C-S MB, onboard Adaptec AIC-7892 SCSI controller

(3) Fujitsu MAN3367MP
http://hdd.fujitsu.com/global/drive/man3xxx/jumper.html#1.1
(1) Quantum Atlas III 318000TD-SW
http://www.maxtor.com/en/documentation/pdf_jumper_settings/atlas_iii_jumpers.pdf

The setup as it POSTS:

SCSI ID's
4, 5, 6 = Fujitsu drives
10 = Quantum
7 = controller

The problem? Transfer speed.
It sometimes shows up as:
160-80-10 (Fujitsu) and 80 for theQuantum or sometimes
160-80-ASYNC and 80 for the Quantum

I have the Quantum at the end of the SCSI chain, the other end terminating on the motherboard.

I have no idea how to get all of these at 160! I have the 3 Fujituss setup as a RAID 5 and the Quantum as a SWAP in Windows 2000.

Going crazy...any ideas?

TIA

~d

1 reply

by djent

I assume the controller is a U160. Check the Asus site for SCSI BIOS ver updates, are you using a cable with termination, try contact cleaner on all bus connections, try a different cable(LVD W/terminator). SCSI connections and terminators are critical, I have had new cables from Adaptec fail. I prefer LVD cables with replacable terminators. If all those steps fail you may have one or more drive controllers pulling the bus speed down, try removing the raid drives one at a time. Move the swap file to raid and remove the Quantum. Note changes. For a number of reasons I won't use any SCSI drives but Seagate Cheetahs, I've tried the rest.

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