"James R. Van Zandt" wrote:
> Benjamin Scott <[EMAIL PROTECTED]> writes:
> The standard grandfather/father/son
> rotation keeps nineteen copies of your data at any given time.
>
> I count 3 copies. Obviously I'm missing something. Would you expand
> on this a bit, or provide a pointer?
Refer to http://www.sun.com/datacenter/continuity/recovery/backup.html
for a more detailed explanation. Basically, Grandfather is MONTHLY,
Father is WEEKLY and Son is DAILY. So Mon - Thu = 4 Sons, Week 1-4 = 4
Fathers, 12 months = 12 Grandfathers. 12 Grandfathers + 4 Fathers + 4
Sons is 20. Then there's Tower of Hanoi, but that's another story.
--
Dan Jenkins ([EMAIL PROTECTED])
Rastech Inc. --- 21 Curtis Lane, Bedford, NH 03110 --- 603-627-0443
Technical Support for a quarter century
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