Re: StorEdge Enterprise Backup vs Veritas NetBackup
From: Michael Vilain
Date: 07/13/03
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Date: Sat, 12 Jul 2003 21:38:11 -0700
In article <pan.2003.07.12.21.05.24.157721@white-tower.demon.co.uk>,
"Julian Regel" <news@white-tower.demon.co.uk> wrote:
> I have been tasked with investigating a backup/restore solution that will
> be used to backup a Sun 3310 NAS with up to 1.3TB data. At the moment, the
> L25 tape library with SDLT320 drive(s) looks like it will be the right
> hardware for us, but I am interested in opinions with regards to software.
>
> At the moment, we backup our Sun servers (An E450, E3000 and V880) using
> ufsdump. I am keen to keep doing this for the operating system using local
> DDS4 drives as it will make system restore in the event of a disaster much
> quicker (or that's my understanding at least). Over time we intend to
> migrate much of our "non-operating system" data off the servers and onto
> the NAS.
>
> Question is, Sun are selling both StorEdge Enterprise Backup (formally
> Solstice Backup (a rebadged Legato Networker?)) and Veritas NetBackup. Are
> they equivalent products? Is one aimed at the lowend and another at the
> high end? What are the pros and cons of each?
They both have their pluses and minuses. I haven't seen the current
versions, but neither of them do "vaulting" the last time I looked some
years ago. NetBackup used to have an add-on to allow you to keep track
of off-site media that aren't in the jukebox. If your tapes are going
off-site, you'll need some way to track where they are.
The big problem with all the backup products is the catalog. When media
is "active" and contains files, the catalog holds this information. The
longer you retain the backups on the media, the larger the catalog
becomes. Be prepared to have this catalog on storage that has _lots_ of
room to grow. Calculate how many files you backup daily and how long
they'll be around. Both vendors have formula to figure out how much
overhead the catalog will take. Another big problem is when backups
"expire" out of the catalog, maintenance must be run regularly to
reclaim the expired space. In a couple of the products I've used with
very large catalogs (and yours will be right up there), this can take
over 8 hours, during which backups cannot be run nor the process halted
or interrupted. Corrupting this database is _very_ bad as it could not
allow you to do restores. Be sure there are tools aplenty to repair it.
Be sure you can run backups while the catalog is in maintenance mode or
do maintenance on only part of the catalog. If it's multiple files
rather than a single monolothic file, that's also better.
Some of the products just "forget" the files on an expired tape and
there's no way to recover them. I know you can get them off with Legato
but I don't know about Netbackup. This could be a problem if you're
doing archiving. I'd stay with ufsdump for that.
Contact both companies and get references for accounts that have similar
amounts of data you want to backup. Find out what they do.
-- DeeDee, don't press that button! DeeDee! NO! Dee...
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