tail of two scsis

[Richard Emberson]

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
> 
>