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SCSI Termination Do I need terminator on the 50 pin channel?

G

Gawker

Junior Member
I have an Adaptec 2940 UW with 68pin and 50pin devices.

ID 7 is the Adaptec host controller with automatic termination.

The last devices on the 68 pin is a 18 gig drive with a 80pin sca to 68 pin adapter. The adapter has jumper called termination power. I can only assume this is my termination. So I placed a jumper on it.

On the 50 pin cable, I have 3 devices. 2 cdroms and 1 iomega drive. I do not have any termination on this chain.

Do I need to terminated on the 50pin channel?

6,5,4 are the 50pin devices
3,2,1,0 are harddrives.

My Problem, is when I copy files on the drive at the end of the chain, it takes forever to copy files to itself or to other drives.


😕
 
Well, I tried terminating the last device on the 50 pin chain and it hung the controller.

I noticed their is a jumper for synchronus transfer on all 4 of my hard-drives, should I jumper these?

 
Looks to me like you still dont have proper termination on the Wide buss. Move your SCA device to one of the inner connectors, remove the term power jumper from the adaptor, and place a self terminating drive at the end of the cable. Your SCA drive may also have a termination jumper on it somewhere if you check the manufacturers jumper charts for that drive. The SCSI adaptor itself should control sync data transfers but you may want to set those jumpers if performance is slow. All drives should have no termination set but the end drives on each cable, auto term set on adaptor. I also set the parity jumpers on all drives. Try this and let us know. The fastest drives should have the lowest priority on the buss as well which it appears you already have correctly set..it matters not where on the cable they are, just their ID set as such. If you have easy SCSI then install it when done and use the SCSI explorer to verify your setup and SCSI Bench to test thier performance. Good luck.
 
3 of the drives are Fujitsu MAA31822SC and have no jumpers anywhere. Looking at the manual and website, shows similar models with these features, but none on this model.

🙁

I will swap one of these drives with a seagate barracutta which has a terminator on it.

Will keep you posted
 
Gawker, your drive settings are listed in the discontinued drives section.. it doesnt show many options for those drives unfortunately.
 
Well, I switched Scsi cards. now I got mondo headaches.

Installed an Adaptec AAA-133 3 channel raid.

Can't install any OS NT4, Win2k etc.

Bombs out with cd1000.sys error. Adaptec has this on their website. The fix is to install by Floppy which I did and received the same error message. Or make a 300 meg partition and copy the i386 folder. Well, I can't access the array from dos with drivers. and no dos drivers!!

 
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