Re: 2-tape drive testing

[Alex Sim <ASim@lbl.gov>]

Luis Bernardo wrote:
> 
> On Thu, 1 Oct 1998, David M. Malon wrote:
> 
> > >
> > >  I was thinking a little more about the 2-tape drive issue.
> > >  Rather than arange to have 2 drives put into one class
> > >  of service so that an individual tape may go into either
> > >  drive, what about just spreading files over 2 existing
> > >  classes of service.  When we retrieve them, a given file
> > >  will always go to the same tape drive, but we will
> > >  know that the files are spread across at least 2 tapes.
> > >  We can also do this without a reconfiguration of hpss.
> > >
> > >  Doug
> > >
> >
> >    Wouldn't this imply that Luis would need to know the class of
> >    service, rather than just the HPSS path, for every file?  I know he uses
> >    setcos with a fixed number in his pftp scripts now.  If Luis
> >    needs to write code to accommodate this approach, it becomes a matter of
> >    resources and time (GCA effort vs RCF effort?); I think Luis is also
> >    working on a couple of other issues (we've been running with cmanager.old,
> >    for example).
> 
> I believe the problem with cmanager (not cmanager.old) was the script. I
> changed "cmanager.old -g $1" into "cmanager $1" and it's running now.
> Alex, what's that -g for? cmanager was not expecting that and that's why
> it was crashing. That's what I think.
> 
> >
> >    Luis, what would implementing Doug's suggestion require on your part?
> >
> In principle it would be quick to make changes to accommodate different
> classes of service and different HPSS paths for different files. The issue
> is where the CM would get that information from.
> 
> Luis
> 
> --------------------------------------------------------------
> Luis M. Bernardo  <lmbernardo@lbl.gov> <www.lbl.gov/~bernardo>
> Scientific Data Management Research & Development Group
> Lawrence Berkeley National Laboratory
> Berkeley, CA 94720
> 

When the cmanager crashed, the script was not used.
In fact, the script uses only fake cache manager at this point.
I never made the script use the real cmanager.
So, crashing comes from somewhere else. In fact, when the crash
happened, cmanager read all the gc.config information and then gave a
segmentation fault.
The reason that there is -g in the cmanager.sh (script) is that fake
cache manager uses it
for the path for gc.config.
--Alex

-- 
Alex Sim                        
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