problems to expect with >2TB volumes

problems to expect with >2TB volumes

[Bernd Schubert]

Hi,

we have not bought the device yet, but presently in the process to do so.
Before we buy it, I want to know about problems in advance...

I'm somewhat worried about this problem report
http://lists.freebsd.org/pipermail/aic7xxx/2006-January/thread.html#4280
Especially as I don't see a final solution... 
We also want to buy the very same raid device and also connect it to an
already existing aic79xx controller.

Thanks in advance,
Bernd

Re: problems to expect with >2TB volumes

[Douglas Gilbert]

Bernd Schubert wrote:
> Hi,
> 
> we have not bought the device yet, but presently in the process to do so.
> Before we buy it, I want to know about problems in advance...

None that I'm aware of from the point of view of the
Linux SCSI subsystem (starting at about half way through
the lk 2.4 series or 4 years ago).

> I'm somewhat worried about this problem report
> http://lists.freebsd.org/pipermail/aic7xxx/2006-January/thread.html#4280
> Especially as I don't see a final solution... 
> We also want to buy the very same raid device and also connect it to an
> already existing aic79xx controller.

On reviewing that thread, the original poster was
jumping to premature conclusions. Justin Gibbs told
him there was no such problem (and Justin is well
placed to know). Then the final post shows a trace
with READ(10) commands failing. They are 32 bit lba
read operations that have been the default for about
10 years in the SCSI subsystem. If those fail on that
transport it is probably a termination problem.
When Justin saw that he probably didn't bother
responding again.

Doug Gilbert

Re: problems to expect with >2TB volumes

[Bernd Schubert]

Hello Douglas,

thanks for your help, I was just a bit worried when I read  the thread.

> On reviewing that thread, the original poster was
> jumping to premature conclusions. Justin Gibbs told
> him there was no such problem (and Justin is well
> placed to know). Then the final post shows a trace
> with READ(10) commands failing. They are 32 bit lba
> read operations that have been the default for about
> 10 years in the SCSI subsystem. If those fail on that
> transport it is probably a termination problem.
> When Justin saw that he probably didn't bother
> responding again.

For a non-scsi protocol expert those scsi card dumps really don't say 
anything :(

Thanks again,
Bernd

-- 
Bernd Schubert
Physikalisch Chemisches Institut / Theoretische Chemie
Universität Heidelberg
INF 229
69120 Heidelberg
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