Alan Beagley wrote:
> On 02/07/08 04:38 pm Ed Durrant wrote:
>
>   
>>>>> It seems that my 73GB Seagate SCSI drive (still in
warranty) is dying, but
>>>>>
>>>>> (a) the BIOS Verify utility says it is fine;
>>>>>
>>>>> (b) dfSee detects multiple write errors on *some* partitions;
>>>>>
>>>>> (c) under eCS some write operations fail on partitions
that dfSee finds 
>>>>> to be error free.
>>>>>
>>>>> Why the discrepancy?
>>>>>           
>
>   
>>>> I wouldn't  trust the BIOS Verify utility as much as DFSee
or actual 
>>>> operation of the system. You could have the old favorite -
a termination 
>>>> error on the SCSI chain or (worse) it could be the
controller that's 
>>>> going faulty not the drive.
>>>>         
>
>   
>>> Bur this is only one drive of the four on the same chain, so I don't 
>>> think it's a controller or termination problem.
>>>       
>
>   
>> Are you sure that the SCSI chain is ONLY terminated at both ends - that 
>> means if the card is at one end of the chain, it should be set to 
>> terminate the chain and the drive at the other end of the chain set to 
>> terminate the chain. NONE of the drives in between should be set to 
>> terminate. If the controller card is in the middle of the chain, such as 
>> when both an internal and external connector are in use, the card should 
>> NOT be set to tern\minate only the devices (diaks or tape drives) at the 
>> ends of the run should be set to terminate.
>>     
>
>
> Leaving aside the fact that everything was running fine for 18 months or 
> so on this controller, here's a brief excerpt from the spec.:
>
> "External Connectors
> 	One 68-pin HD for LVD SCSI devices
> Internal Connectors
> 	One 68-pin for LVD SCSI
> One 68-pin for Ultra Wide SCSI
> One 50-pin for Ultra SCSI"
>
> Nothing is connected to the external connector.
>
> I have four SCSI drives (1xU320, 1xU160, 1xU2W [previously two of 
> those]) and an LVD tape drive attached to the 68-pin LVD connector. 
> There is a terminator at the end of the chain.
>
> I have a SCSI CD-ROM drive attached to the 50-pin connector. Termination 
> is ON.
>
> Termination for the adapter itself is set in the SCSI BIOS to Auto.
>
> I did manage to find a Knoppix boot CD and ran the Seagate Linux 
> diagnostics. A "long" drive Self-Test said all was OK -- so Seagate 
> isn't going to want to replace the drive anyway.
>
> I have moved the problem drive from ID1 to ID4 in case there was a 
> problem with the address lines, but dfSee still finds numerous errors, 
> and attempting to unzip a file to a partition on the drive hung the system.
>
> I've been looking out for an Adaptec U320 adapter on eBay, but so far I 
> haven't found the right one at the right price.
>
> I might try the drive in a different machine and see what results I get.
>
> -=-
> Alan
>
>
>  
Hi Alan,

  as I am sure you know, in an ideal world you do not mix interface 
(U160, U320, U2W) types on one chain and the recommendation I have 
always been told is never put a tape drive on the same adapter as a SCSI 
disk. Any of these actions (despite one would think different lines are 
in use) can, it is said, cause performance and possibly data corruption 
problems.

 You say however that this configuration has been working fine for some 
time, which would suggest with the old hardware all worked well 
together. Perhaps the new drive simply does not like this mixed 
environment. Is there any way you can isolate the new drive on its own 
interface of the SCSI card ?

Cheers/2

Ed.
 


 
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