tail of two scsis

[Jeff Vian]

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
>>
>>
>
>