Depends what backup software you are using.
For example, I daily append my spoolfiles to a
backup tape using BackPack. I can get about
45 appended spool file backups to a 90M DDS
tape before it wants another one. (I think
the limit is 512 or 256 appends.)
It brings to mind a recurring issue I have
with Backpack, whenever I have more than
a dozen or so appended backups to one tape,
the console reports that I have a "dirty"
tape or that the tape drive needs cleaning.
So I clean.
What bugs me in the back of my mind is, it
BackPack "really" reporting a dirty tape or
is it hitting a flag that says 10 or more
rewinds means to report it as such? This
is because I think it increments a counter
every time in his a new directory.
Tracy Johnson
MSI Schaevitz Sensors
> -----Original Message-----
> From: Cynthia Fowler [mailto:[log in to unmask]]
> Sent: Friday, January 10, 2003 3:53 PM
> To: [log in to unmask]
> Subject: Re: [HP3000-L] Overwriting backup tapes?
>
>
> I'll address your second question. You have several options.
>
> 1. You can invest in a faster tape unit.
> 2. You can buy a 2 or 3 other tape units and run your backups in
> "parallel" so that all tapes are being written to simultaneously.
> 3. Check to see if you have your backup software running optimally.
> We had slow backups for a while, but discovered we were not
> using our software to full advantage; that is, we did not have
> the job set up so that it ran as fast as possible. Once
> we rewrote
> the job, we decreased the length of time it took to complete the
> backups by a third or better.
>
> There may be other options, but these are the ones I recall.
>
> Cynthia Bridges-Fowler
> HP3000 System Administrator
> North American Salt Company
> a division of Compass Minerals Group
> [log in to unmask]
> http://www.compassminerals.com/
>
> >>> "Gehan G." <[log in to unmask]> 01/10/03 02:22PM >>>
> Hello list friends,
> I've been thinking about our backup tapes recently and I
> thought of some questions that I can't seem to find an answer
> to..
>
> First,
> I have a 2 Gig tape which a partial backup was made on it
> which takes up only 500MB of the tape.. If I want to back up
> another 500MB group on to tape but don't want to waste another
> tape on such a small job then.. Is there a way to append to a
> tape, add files to a tape with out washing out the previous
> backup?
>
> Second,
> What is the fastest tape drive out there? Presently our
> backups take about 4 hours to run. Is there any way to speed
> that up? Different tape drive, different type of tape perhaps?
> Or is that all dependent on the speed of your proccesser and
> such?
>
> Just curious,
> Gehan Gehale
>
>
>
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