Hal Merritt wrote:
Gee. Doesn't 'single point of failure' count for anything any more? What
happens when (not if) one of those tape goes bad or gets destroyed?
That's one heckofa lot of data lost.
I guess that means one might want to have more than one copy. Two would
be better. Gee. This solution is getting expensive.
Just a thought.
Let's assume you have SMALL cart, and small amount of data.
Now the cart went bad/got destroyed. You don't worry too much, because
it's only small amount of data, do you ?
After that you check what data was lost. Single file,
SYS1.MOST.IMPRTNT.DATA. <g>
Problem is not capacity-dependent IMHO.
For ML2's recovery can be capacity-dependent, after thousands ML2s lost
you cannot fix catalog entries/do restores manually - too much trouble.
Some scripted solution seems to be a must. Of course it also would work
with small capacity carts.
BTW: ML2 datasets have backup, otherwise they won't be migrated.
BTW2: You can exploit duplexing or tapecopy to have two copies on two
carts. IMHO it's inexpensive.
--
Radoslaw Skorupka
Lodz, Poland
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