QLogic Fiber Channel with isp.c

[Matthew Jacob]

Nearly always has to do with a lost frame, but sometimes buggy
firmware in targets.

The internal data engine has a count that doesn't then match up and
indicates a residual (often negative) that is not then marked in the
FCP RSPNS IU as being an underrun.

Many FC drivers ignore this issue, as there have been a number of
devices whose f/w doesn't correctly set the underrun flag.

I chose to believe it.

On 4/20/05, Rajesh S. Ghanekar <rajesh_ghanekar at persistent.co.in> wrote:
> Rajesh S. Ghanekar wrote:
> 
> > Hi,
> >
> >    We had a problem when a disk shelf failed. The error message is as
> > follows:
> >
> > Mar 23 15:33:09 freebsd /kernel: isp0: bad underrun for 0.0 (count >
> > 65536,
> > resid 2147422207, status not marked)
> >
> > I would like to know the reasons of what causes Data Underruns in FC
> > Adapters?
> > Any pointers?
> 
> Sorry for providing insufficient data.
> 
> OS Version: FreeBSD-4.10
> FC HBA: QLogic ISP 2300
> 
> 
> Thanks,
> Rajesh
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