Let's say you wanted fulls every 2 weeks, cum incrs every other week (in
between fulls) , and diff on all other days:

Full - frequency = 2 weeks
Cum Incr - frequency = 1 week
Diff Incr - frequency = 1 day

Then set the windows for all these schedules to the same thing, say midnight
to 9am on all days for all schedules.  On day 1 the full is the most over
due b/c it has the longest period between schedules (2wks), then diffs incr
will run for 6 days, then you'll get a cum incr on day 8, more diff incr for
6 days, then the full again on day 15. rinse and repeat.

In the above if you set fulls to once a month, you'll get every month: 1
full, 3 cum incr and 27 diff incrs, or there abouts. .

If you want to do testing on this and other permutations, try using hours
for frequencies (instead of days/weeks) so you can watch how it works all in
one day.  :) Pick test files so they run quick, and disable catalog backups
during testing so it does not affect schedule timing if catalog is actively
getting backed up.


A.S.


-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Melinda
Orms
Sent: Tuesday, October 23, 2001 4:39 PM
To: Veritas Mail (E-mail)
Subject: [Veritas-bu] Request for Scheduling Advice: windows NT clients




Hello All,

I have previously thought that a cumulative incremental backup would
catch everything that has changed since the last successful backup.
However a cumulative backup (using the archive bit) is basically just a
differential that does not clear the archive bit when complete.

Does anyone have a suggestion for achieving a schedule that would
function as follows:

full
    <-------diff incrs
    <-----------------cum incr
                                  <---------diff incrs
    <-------------------------------------------------------cum incr

....etc

I fill approximately 215 dlt tapes/month with differentials alone.
Restores of small directories require several tapes.  I would like to
need only the last full , weekly, and subsequent days' tapes.

I appreciate any suggestions on how to manage this and compromises that
other departments have made to deal with this issue.

Advance thanks,
Melinda





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