--On Thursday, October 16, 2003 16:25:48 +0100 Tom Brown <tom.brown AT 
goodtechnology DOT com> wrote:

>> > tapecycle 20 tapes:
>> > number of tapes to use per dumpcycle of 2 weeks. 10 tapes X 2 dumpcycles
> =
>> > 20 tapes.
>> 
>> Yes, but you really should have an extra tape or two in there to lessen
>> the chance of a failed backup overwriting your last full backup.  You
>> should really consider doubling that number so you always have two copies
>> in case one should error on a restore (in which case you would lose your
>> newest data but you could at least still recover older files.).
> 
> really? in my case i allways have tapecycle as dumpcycle*runspercycle
> 
> is that bad?

Sorry, it was too early in the morning for me to comprehend.  I somehow
got the idea that  his tapecycle = runspercycle, completely missing the
fact he had double the runspercycle.

Having extra tapes never hurts, though.

Frank
> 
> e.g ...
> 
> dumpcycle 1 weeks       # the number of days in the normal dump cycle
> runspercycle 5          # the number of amdump runs in dumpcycle days
>                         # (4 weeks * 5 amdump runs per week -- just
> weekdays)
> tapecycle 5 tapes      # the number of tapes in rotation
> 
> or another config....
> 
> dumpcycle 2 weeks       # the number of days in the normal dump cycle
> runspercycle 10         # the number of amdump runs in dumpcycle days
>                         # (4 weeks * 5 amdump runs per week -- just
> weekdays)
> tapecycle 10 tapes      # the number of tapes in rotation
> 



-- 
Frank Smith                                      fsmith AT hoovers DOT com
Systems Administrator                           Voice: 512-374-4673
Hoover's Online                                   Fax: 512-374-4501