On Friday 24 September 2004 09:26, Ivan Petrovich wrote:
>Jon,
>
>> Hypothetical -- I just checked, my root FS has 100,000 files.
>> My level 0 of the / DLE thus is 100000 files.  Guessing that
>> on any one day, maybe 1000 change and appear in incremental
>> backups.  If I do a level 0, then three incrementals,
>> WITHOUT the level 0 I only have a 3 in 100 chance the file
>> I need might be in the incrementals.  When you come around on
>> your tapecycle, you will be overwriting that level 0.  The
>> more level 0's you have, the better chance that the file(s)
>> you need will be on a tape somewhere.
>
>But if (tapecycle >= runspercycle + 1) then you would not ever
>overwrite any level 0. Right?
>
>Ivan

I believe thats true.  However, its a bit like having all your eggs in 
one basket, so most of keep at least 2*runspercycle tapes.  That way 
if the first backups no good, you can back up a day at a time until a 
good one has been found.  Tapes for some drives (DDSn) are cheap, 
while some of the others definitely come in the "Oh my gawd" 
territory.  The latter will make you manage the tape stock for 
minimum cost.  Which is why I just spent a hair over 200 for a 200GB 
disk drive and made virtual tapes out of it.


-- 
Cheers, Gene
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