[Info-vax] Unpleasant Disk Shadowing Surprise

[Kenneth Fairfield]

On Wednesday, October 12, 2011 12:19:24 PM UTC-7, MG wrote:
> On 11-10-2011 22:16, Kenneth Fairfield wrote:
> > I was more interested in what SHOW DEVICE DK shows
> > for the members of the shadow set in question.  Errors
> > on the PK device are not terribly interesting most of
> > the time (they tend to come in ones and twos at boot
> > time, etc.).
> 
> That's something I've noticed as well.  One dual channel Ultra320 SCSI
> controller usually gives three errors, during boot time.  But, after
> that it simply works flawlessly without any errors whatsoever.
> 
> What do you think it might be, most of the time, in your experience?
[...]

No idea.  Perhaps Rob Brooks has one.  

Having come from HSJ/CI-attached storage where no errors
like these get logged (on mount or boot), and having 
similar experience as yours, I just took it to be 
characteristic of FC-attached disks.  Whether it's the 
device drivers, some sort of polling of the devices, or
whatever, they just seem to work that way.

    -Ken