Re: tail of two scsis

[Jeff Vian <jvian10@xxxxxxxxxxx>]

Richard Emberson wrote:

> Well riddle me this:
>
> Last night I turned on the machine and the bios magically found the
> second scsi disk, disk B.
> (I spent the next hour backing it up onto other systems :-)
>
> So, the disk kind of comes and goes; sometimes its there and sometimes
> its not.
>
> Richard


So it seems confirmed, the drive is dead.  Sometimes it spins up and 
other times no-go.

Certain models of seagate drives were known for excess sticktho for a 
while.  After being used a while they would not spin after a power down 
until they had been rapped vigorously to free the heads from the disks.

You may be seeing a similar action.

In any case, with it not reliable, ditch it.

> Jose Luis Ricardo Chavez wrote:
>
> > Richard Emberson wrote:
> >
> > > Jose Luis Ricardo Chavez wrote:
> > >
> > > > Richard Emberson wrote:
> > > >
> > > > > Jose Luis Ricardo Chavez wrote:
> > > > >
> > > > > > Richard Emberson wrote:
> > > > > >
> > > > > > > I've got a FC2 system and a scsi disk with /boot and /.
> > > > > > > In addition, I have two other scsi disks with /home and /usr/local
> > > > > > > on them (call the disks A and B). Both of these disks
> > > > > > > have their IDs set to 6.
> > > > > > > When I boot the system with disk A, disk A can be found and
> > > > > > > the boot succeeds. When I replace disk A with disk B, disk B
> > > > > > > can not be found and the boot fails.
> > > > > > > Other than the possibility that disk B is bad, what else
> > > > > > > could be the cause?
> > > > > > >
> > > > > > > The boot disk is a 7500rpm Quantum.
> > > > > > > Disk A is a 10000rpm Maxtor.
> > > > > > > Disk B is a 7500rpm Quantum.
> > > > > > > Back in my RedHat 9 days, the system used both Quantum disks.
> > > > > > >
> > > > > > > Thanks
> > > > > > >
> > > > > > > Richard
> > > > > > Are both disks using the same SCSI id while connected to the same 
> > > > > > cable
> > > > > > (SCSI channel)? As far as I remember there is not a "cable 
> > > > > > select" option
> > > > > > when using SCSI disks, both disks should use different id's. Put 
> > > > > > the lowest
> > > > > > id on the boot disk (A). If the disks are connected to different 
> > > > > > SCSI channels
> > > > > > then maybe there is a problem with one of them.
> > > > > > - Jose Luis
> > > > > The boot disk is always on the cable. Only one of the disks A and B
> > > > > are on the cable at one time.
> > > > Ok, you have three disks, the boot disk is permanently connected 
> > > > and you connect
> > > > disk A or B when needed. Is the SCSI BIOS detecting disk B?
> > >
> > >
> > >
> > >
> > > No.
> > > It detects disk A (disk B not connected) but not disk B (disk A not 
> > > connected).
> > > The boot disk in both cases is detected.
> > >
> > > > - Jose Luis
> > Well, it seems disk B is damaged.
> >
> > - Jose Luis