This is what Falconstor promotes as one of their features.
You backup server doesn't see the physical library....only the
VTL...then the VTL creates it's barcode inventory by the inventory of
the library....you backup to virtual tape 000001, which is then in the
background duplicated to physical tape 00001 in the phys library.
You have to make conservative estimates of the amount of data that will
fit on a single cart, and hope for the best.
The idea is that if your VTL dies, you rezone your backup server to see
the physical library, and it sees everything, the same as it was
represented by the VTL and you can start restoring directly from
tape....I guess the VTL acts as a proxy/cache to the physical library.
One big issue here is that you have a horribly corrupt catalog if some
data has not be staged back to physical tape at the time of failure, or
whatever the case is.
Your duplication has to be scheduled/configured via the VTL, vs the
media server.
Granted, this is not the only way Falconstor's VTL can be used, but it
is promoted by the company.
Paul
--
> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of bob944
> Sent: May 23, 2006 1:28 AM
> To: veritas-bu at mailman.eng.auburn.edu; 'Darren Dunham'
> Subject: Re: [Veritas-bu] compression to disk staging unit
> "[M]ap directly onto physical tape?" With my usual subtlety and
> understatement, let me say that this is absolutely insane. <insert
> smiley> A TAPE IS NOT A FIXED NUMBER OF BYTES/BLOCKS/SECTORS LONG.
> This has nothing to do with compression; it has everything to do with
> the nature of the medium. Gaps vary, speed can vary, BOT/EOT
> (archaic)
> positions vary, tape backs up and erases a couple of inches of tape
> after r-a-w errors, ... Not only do different tapes hold different
> amounts of identical data, but the same tape will likely hold a
> different amount of data if you write the same data to it twice.
-------------- next part --------------
====================================================================================
La version fran?aise suit le texte anglais.
------------------------------------------------------------------------------------
This email may contain privileged and/or confidential information, and the Bank
of
Canada does not waive any related rights. Any distribution, use, or copying of
this
email or the information it contains by other than the intended recipient is
unauthorized. If you received this email in error please delete it immediately
from
your system and notify the sender promptly by email that you have done so.
------------------------------------------------------------------------------------
Le pr?sent courriel peut contenir de l'information privil?gi?e ou
confidentielle.
La Banque du Canada ne renonce pas aux droits qui s'y rapportent. Toute
diffusion,
utilisation ou copie de ce courriel ou des renseignements qu'il contient par une
personne autre que le ou les destinataires d?sign?s est interdite Si vous
recevez
ce courriel par erreur, veuillez le supprimer imm?diatement et envoyer sans
d?lai ?
l'exp?diteur un message ?lectronique pour l'aviser que vous avez ?limin? de
votre
ordinateur toute copie du courriel re?u.
|
