> > Subject: RE: [Veritas-bu] SDLT restore problem
> > 
> > 
> > Ken,
> > 
> >   Have you tuned NUMBER_DATA_BUFFERS and SIZE_DATA_BUFFERS? 
> > 
> >   When we started working with LTO drives we followed our 
> SE's tuning
> > process. This was basically increase the size and number 
> > until backups fail,
> > then try restoring. Back the sizes and number down until 
> > restores work.
> > 
> >   And it seems tuning for optimal performance will be 
> > different for every
> > OS. We are running HP/UX and NT here. The tuning between 
> > HP/UX and NT are
> > way different. I'm pretty sure it will differ between 
> HP/UX, Solaris,
> > AIX,,,,.
> >
> 
> I have tuned the size and number a little.  We have increased
> them some, but had to back them off a little.  The master/media
> server (Sun E450) has 4GB RAM and we run so many jobs via 
> 10 DLT7000 drives in 2 libraries (SDLT library to replace 1)
> that we started running out of memory and had to back them
> down some.  If we drop the parameters more then we are going
> to definately be in trouble for performance.
> 
> Since I have already installed SSO I might try working on
> the restore from the SAN media server where I can tune the
> parameters seperate from the normal jobs on the master.
> Didn't I read in another message that you can tune these
> differently on each media server?
> 

I ran a backup via the SAN media server and was able to
restore several files back to the client.  It looks like
the problem may be related to the BUFFER parameters.  It 
definately seems to be a problem specific with our master
server.  We are going to begin focusing on that today.

Problem not solved yet, but definately one step closer.

Thanks to everyone,
Ken

> Thanks,
> Ken
> 
> > 
> > Bryan Bahnmiller
> > Enterprise Hosting 
> > Storage Engineer  - development team
> > IT | Information Technology
> > 

<<<<snip>>>>