Re: ARGH, weird SCSI I/O errors on second/third drive on Debian/PPC
On 28 Dec, this message from Jessica Blank echoed through cyberspace:
>> > The thing that confuses me is thus: There are several termination options
>> > for the drive I placed at the end of the SCSI chain (read the Web page I
>> > referred to: http://www.seagate.com/support/disc/scsi/st15150n.html ). I
>> > do not know which ones are correct. "Terminate power from drive"?
>> > "Terminate power to SCSI bus"? I know nothing of these things.
>>
>> Ah, Seagate. They have a jumper to enable termination: that is putting
>> 'the plug on the cable'. This 'plug' needs power, and the other jumpers
>> specify where this power comes from. 'Term power from drive' uses the
>> driv'es power for this. 'Term power to bus' is independant of the
>> on-board terminator; it serves to provide termination power to the
>> reserved wire in the SCSI cable.
>
> Thank you. Which one should I use though?
Put 'Term enable' and 'Term power from drive'; that's usually best for
internal drives. Taking term power from the (rather thin) wire from the
flat cable is in most cases the worse option. Currents are high and
'peaky' at high frequencies.
>> But, there is something else you need to make sure.
>>
>> The error messages you describe _may_ indicate that the filesystems you
>> created are larger than the actual drive. This can happen when
>> partitioning with some (older?) versions of mac-fdisk (aka pdisk).
>>
>
> I seriously doubt this. This is on a fresh install of Woody (Debian 3.0).
>
> Everyone keeps saying that I have problems with the filesystems. I've
> re-created the filesystems a billion times. I doubt that is it...
Well, it's clear that recreating thema million times the same way
doesn't gain you anything. Anyway, if the fs size is your problem, you
can check with 'df' or 'cat /proc/partitions' for instance, and see
whether total capacity reported exceeds the drive size.
For example, see:
mlan@piglet:~$ cat /proc/partitions
major minor #blocks name
8 0 4233600 sda
8 1 50 sda1
So my sda has 4233600 1K-blocks, just as dmesg reports on boot (in
512-byte blocks):
mlan@piglet:~$ dmesg|less
[...]
SCSI device sda: 8467200 512-byte hdwr sectors (4335 MB)
sda: [mac] sda1 sda2 sda3 sda4 sda5 sda6 sda7 sda8 sda9 sda10 sda11
[...]
> Do you know which versions of mac-fdisk had these problems?
Unfortunately no.
Cheers
Michel
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