SCSI Maxing at 40MB/Sec

AndyC · 22 Jan 2006 at 14:34

Hi All,

Always had this problem, that the scsi is syncing at 40MB and not 160 which is the max of the card, It reports this on the card at boot up and also when benchmarked in Windows.

Have the following

Adaptec 19160 Ultra 160
Maxtor Atlas4 73GB 10K Ultra 320
80pin to 68pin Convertor
Cable which came out of a Netserver

Now I though the cable however I did have the one that came with the card and that would do the same ie 40MB/Sec.

However if I put a Ultra 3 18.2 drive in it reports 160MB/Sec - checked the scsi bios and all settings seems correct.

Benchmarked in Windows.

Ultra3 18.2GB ----------------- Ultra320 73GB

Access 8.5 -------------------- 7.3
CPU 2% ----------------------- 0%
Average 28.8M\Sec ------------ 37.8MB\Sec
Burst 95.8MB\Sec -------------- 38.6MB\Sec

Have no idea, there is a jumper on the 68 to 80 convertor that says sync, now I was tempted to gap it but wanted to check first.

I realise the max will be 160 because of the card, have a feeling its something with the convertor. This is a lvd one.

Any ideas would be great.

Andy

AndyC · 12 Feb 2006 at 12:10

Any ideas on this, day to day its fine and still is much much faster than my old IDE, but with the thing stuck at 40MB/Sec I wonder what I'm missing out on.

The cable came out of a Netserver but sure I tried the one that came with the card and it did the same thing.

Getting very tempted to bridge the pins across sync on the adapter but the thought of causing damage puts me off a tad.

Any idea's

Andy

madman045 · 12 Feb 2006 at 19:43

you dont say what motherboard you have the card plugged into, sounds like you limited to the PCI bus, max I get out of mine is around 60mb/s & thats a 15k 73gb scsi drive plugged into a P3 box.

The_Official · 12 Feb 2006 at 20:08

Sounds like either the HDD is configured for SE mode or the 80 to 68 converter is a SE converter and not a LVD.

AndyC · 13 Feb 2006 at 19:10

Thank you for the replies, the board is a Asus socket A with a 2.8Mhz Althon, could be, however the other drive Ultra3 or U160 runs at full speed.

The converter is for sure an lvd as before I did have the wrong one and nothing worked.

Is the setting likely to be a jumper on the drive?

I may be able to borrow some other 80 pin u360 drives from work and give them a go but would rather not if I can help it.

The_Official · 13 Feb 2006 at 19:54

Page 42 http://www.maxtor.com/_files/maxtor/en_us/documentation/manuals/atlas_10kiv_product_manual.pdf
if that is the correct drive also page 35, although it is referring to a 68pin it should also be on a sca version the 1 I had did have simple way is to remove any jumpers on the HDD if there are any on it the worste case could like the 1 I had and it was stuck in SE mode. You could always download the diag software for the drive and check it out.

AndyC · 15 Feb 2006 at 20:49

That's great many thanks for that, had a look and there is loads of info, unfortunately mine has no jumpers on the drive.

Also reading through as you stated it may well be the design of the converter, rather than spend any more cash I will leave it as it is, still plenty fast enough now.

Again many thanks for your help.