Hal Merritt wrote:
Forgive me guys, I don't get it. All HSM does is move data from cheap
DASD to expensive tape and back. I doubt it even does much compression
on modern DASD or tape. It just shuffles data around. Yes, HSM offers
some nice management features, but are they worth the price?
We have about 2 TB over two sites. We look at HSM from time to time, but
just don't see a business case. We end up just buying more DASD.
Unless, of course, you are a competitor. If so, then by all means do
things just because that's the way you have always done things ;-) Our
sales people thank you.
It depends. Sometimes (2TB is good example) it is good to have
everything on DASD, including backups, tapes only for DR, data input,
etc. Second hand DASD are good for such purposes. Price of GB is usually
less than 10% of new one.
However, when you grow up with the capacity you'll find it's more
cost-effective and more convenient to use tapes. Modern tapes. It is not
very expensive when you carefully choose the configuration.
Regarding HSM license: this is a tool for backups. Without it (or
competitive products like FDR) you have to keep track of every file's
backup manually. Error prone. With HSM you set up managament classes,
some ARCCMDxx and sleep safe.
Migration facility is an option, which need not be used.
--
Radoslaw Skorupka
Lodz, Poland
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