> On Fri, 11 Aug 2000, System V wrote:
>
> > I created the folowing chain:
> > ____________
> > / BOX 1 \
> > | T-C-D-D-D--------\
> > \____________/ |
> > |
> > ____________ |
> > / BOX 2 \ |
> > | T-C-D-D-D--------/
> > \____________/
>
> > When I pull the powercord of a disk, the scsi-bus crashes :-(.
> > And the kernel starts complaining and resetting the scsi-bus (And it
> > keeps on doing this)
> > Meanwile, the system becomse _verry_ slow, so slow you can't do
> > annyting...
Were there IO's going on to the disk when the power was dropped? Who is
driving term power?
I have seen problems with drives being powered on connected to a SCSI Bus
causing a capacitance problem but not normally losing power. As was mentioned
on another thread about shared busses electrically SCSI was never really
intended for hot adding/removing even though there has been a lot of work to
allow it. When devices do things electrically clean it can be made to work.
But not all devices worry about this when they are developed so if powering
the device off causes electrical fluctuations on the bus then ....
>
> I have the same observation on a 2940 with just an external CD writer.
> Power cycle the writer and have 2.2.16's aic7xxx in an unrecoverable
> reset loop.
Where is termination and how is it terminated? In particular does the loss of
power cause the termination on the CD writer to go away? Likewise for term
power.
Eddie Williams
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