Re: IBM 9Gb SCSI disk
- From: "Tim Clarke" <SpamBlock.Monetaim.Com@xxxxxxxxxxxxx>
- Date: Sun, 09 Oct 2005 08:48:15 GMT
"Sasa" <sasa.grgasovic@xxxxxxxxxxx> wrote in message
> I want to surprise my old PC Server 325 with "new" 9Gb IBM SCSI disk. It's
> model DNES-309170.
> There are already 2x2Gb drives in machine, scsi id:0 and id:1. I want to
> this drive to live on scsi id:2 however I'm not sure how to set it.
> There's row of jumpers from 1 to 12 and they're labeled like this:
> 1 id bit 3
> 2 id bit 2
> 3 id bit 1
> 4 id bit 0
> 5 enable auto spin
> 6 s/e mode
> 7 disable unit attn
> 8 ti sync nego
> 9 auto start delay
> 10 delay start 6/12
> 11 diable parity
> 12 led out
> There are currently jumpers on position 3. and 8. How to jump this drive
> work on scsi id:2? Are other settings ok?
the only one you should *need* to jumper is position 3 = Id. bit 1 = 2^1
= ID. 2.
You may want to jumper position 5, to auto-spin the drive at power-on,
since you've only 3 drives, which won't overload the PSU. If you add more
drives, you might want to jumper position 9, this delays the auto-spin,
based upon the drive's ID. This balances the power-on loading on the PSU.
I'm too lazy to look up the SCSI support of the Server 325 to know
whether you need to jumper position 6 to force Single-Ended SCSI only mode
(as opposed to Low-Voltage Differential SCSI). It's never been my experience
that this was necessary. You can leave position 8 (Target-Initiated
Synchronous Transfer Negotiation) jumpered. This is an optionally SCSI
feature/function and may or may not have any effect, but won't stop anything
from working. Position 11 should *never* be jumpered for use in an IBM
system. They always *require* SCSI Bus Parity.
Tim Clarke (a.k.a. WBST)
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