Agree with comments here with Paul. As I mentioned, most of this relies on
the type of Data you as a business are backing up.
And its not likely the business is going to want to change the way they
create their Data.
If you get 400GB on a tape, you should be happy; I have seen around 600MB
crammed on a tape, but like a pint of beer, if you leave the tap running,
you need another glass to fill it.
And I will gladly drink it :-)
Regards
Simon Weaver
3rd Line Technical Support
Windows Domain Administrator
EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU
Email: <mailto:Simon.Weaver at Astrium-eads.net> Simon.Weaver at
Astrium-eads.net
-----Original Message-----
From: Paul Keating [mailto:pkeating at bank-banque-canada.ca]
Sent: 31 October 2006 19:22
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Determine efficiency of tape usage.
Not to be pedantic, but you're getting as much data on the tape as the tape
can hold. :o\
It's a 400GB tape, so it will hold 400GB of data, which may translate as
800GB of highly compressable data......how compressed your data starts out
is dependant on the type of data......
ie, lots of plain ASCII text files and you might be able to compress 800GB
onto the 400GB tape, but images, music, dense DBs, etc, you might only get
450GB on a tape.....either way, "getting your money's worth" is kind of an
odd perspective.
If you're paying more for larger capacity tapes, you're paying for the
native capacity. The compressability of your data isn't determining value.
If you're looking at value in a Gigs/Dollar perspective, you may or may not
want the larger tapes, you may want LTO1 or 2. I haven't looked at costs
lately.
The value in larger capacity tapes is in the overhead....less media to
manage, smaller library footprint, etc, etc.
The TCO is lower, even if the Gigs/Dollar ratio isn't the highest.
Your data is your data....You typically can't change that.
I'd imagine your company isn't going to change their Line of Business so
they have more compressable data to backup. :o)
Sorry if this provided no help at all, as far as answering your question,
but I suppose it's food for thought.
Paul
--
-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Sixbury, Dan
Sent: October 31, 2006 2:07 PM
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Determine efficiency of tape usage.
How do you determine the efficiency of your tape usage? i.e. I was just
asked recently about our use of LTO3 tapes since they can hold up to 800 GB
compressed, how much we were actually consuming. i.e. if we are getting our
money's worth for the larger capacity more expensive tapes.
Thanks
Dan
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