SCSI U160 Help ! - Gearspace.com
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SCSI U160 Help !
Old 18th February 2003
Gear Nut
MickeyBee's Avatar
🎧 15 years
SCSI U160 Help !

I bought two 10.000rpm SCSI U160 drives for my DAW.
Ive got SCSI ultrawide onboard and i asked somebody
(dont remember now) if i could run the new drives on my ultrawide adapter til i could afford a u160 raid card.
-Thats ok but you wont get the full bandwith.

At the same time i bought some new ram, a midi interface etc
and i had nothing bou trouble since. Ive seen more blue screens
than i thought was possible. Strippin down the system totally i now suspect somethings not right with u160 drives on a
ultrawide adapter.
Bluescreens appears randomly but i can almost ceartain produce a blue screen bu installin from disk 2 to the first (OS disk)

Could it be to much traffic on the ultrawide adapter, caused by the
SCSIU160 drives ?
In that case Mr.Somebody was wrong..dead wrong.

Anybody with scsi experience ?
Old 18th February 2003
Gear Maniac
🎧 15 years
Re: SCSI U160 Help !


I install and maintain LAN's for a living (too).

SCSI controllers are for the most part, cross & backward compatible.

A U160 controller works 100% with a UW drive.
A U160 drive will work PERFECTLY with a Ultra SCSI, SCSI I, II UW or even U320 SCSI controller.

I have over 1 terabyte of drives, in a mish mosh of (mostly U160 10k rpm) drives

Things to check for...

1. Termination. Make sure you're using the right type for the DRIVE, not for the chain.

2. Duplicate SCSI ID's

3. Poor / inferior cabling

4. Reduce the config to one drive...
Old 18th February 2003
Gear Nut
MickeyBee's Avatar
🎧 15 years
Termination, thats it !
Now i remeber the similar behaviour
on a system i had ages ago. I solved my inexperience then with a cable with termination onboard and removed all termination from the drives.

But still unexperienced (i dont remember) herse a couple of questions:

Terminate only the last disk in the chain, right.

My U160 drive does not have "term enable" like my UW drive
but a "force single ended" is that the termination jumper ?

Is there anything else important on the termination issue, "tp to bus" or "tp from drive" ?
Old 25th February 2003
Lives for gear
cashewcupcake's Avatar
🎧 15 years
Your buddy was right. You can put those two drives on an ULTRA2 HBA. You don't need to upgrade to an ULTRA3 HBA if you're only using 2 10K RPM disks. They probably can spit out about 50MB/second in a RAID 0 and ULTRA2 bandwidth is 80MB/second.

You put your terminator on the last device in the chain. Per channel. You don't want self termination or electronic termination or anything like that.

If you're getting blue screens it's probably not related to your drives. What OS is this?
Old 26th February 2003
Gear Nut
MickeyBee's Avatar
🎧 15 years
Ive orderd another scsi-cable...read something about "twisted pair" and a terminator plug to get rid of the self/electronic termination.

Also found out my new drives came with no jumpers at all, and i need to learn if "parity check" should be enabled.
On my old drives and former scsi drives all those jumpersettings
beside term and scsi id was set to default and should not be altered.

Os is win2000..ive got rid of the bluescreens but the system takes forever to shut down.

The main idea with my new drives was to get some trackcount
headroom...mabye try and do a software raid in win 2000, but
now im just happy to get my scsichain to work. There should be
a scsi test program that would tell me if something was wrong.
I mean..now it works but instable and most certain slower than its
capable of.
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