Hi all,

David wrote :

> -----Message d'origine-----
> De : HP-3000 Systems Discussion [mailto:[log in to unmask]]De la
> part de David Knispel
> Envoyé : mercredi 31 octobre 2001 15:33
> À : [log in to unmask]
> Objet : [HP3000-L] Online Backups
>
>
> To the list,
>
> I'm having problems with my Roadrunner (or whatever it is
> now) Online backups.  When I call ROC software they're
> telling me it's because we have less than 20% free disk
> space.  I got the same error last night and I had 25% free.
> Has anyone else seen this error before?  Any ideas as to
> where I can look for solutions?  What other backup software
> is in use?  How's HP's Turbostore?  Same types of problems?

I can't comment on other products (RoadRunner, ORBiT's Backup Plus, etc.),
so I'll stick to what I (pretend to) know : HP's TurboStore.

Whether explicitly (;ONLINE) or implicitly (;ONLINE=START or ;ONLINE=END),
TurboStore will create a sync point and log all modifications brought to the
original files into a "log" called the shadow (quoting from memory). Of
course, at some point in time the shadow will use disk space. That means
that, if the modification rate on files being stored is especially high, the
shadow will have a tendency to grow quite big. Now, factor in dataset
synchronization issues linked to TurboImage integrity (assuming ;PARTIALDB
is not used) and you get a recipe for eating up disk space. IIRC, that space
is marked as transient, so my best guess is that it is less subject to
extent size and free space fragmentation issues.

In other words, expect comparable behavior with TurboStore.

Disclaimer : I'm quoting from my own memory, dating back to the good ole'
5.0 beta test days, back in, well, fall'94 I guess.

And you think aging is a graceful process ?

Christian "Yes, I belonged to HP in one of my former lives" Lheureux
Responsable du Département Systèmes et Réseaux / Head of Systems and
Networks Department
APPIC R.H.
business partner hp invent
Tel : +33-1-69-80-97-22   /   Fax : +33-1-69-80-97-14 / e-mail :
[log in to unmask]
"Le Groupe APPIC recrute, contactez nous !"

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