Re: offsite strategies

[Darin Dugan]

At 01:59 PM 1/6/2003, David Lebel wrote:

Quoting Darin Dugan ([EMAIL PROTECTED]):
> Donald's suggestion is precisely what we're doing here. We choose to send
> the most recent (runspercycle * runtapes) set offsite, as it is the most
> valuable. Others may choose to send an older set offsite so as to be able
> to restore accidental-deletions from the most recent set. Choose according
> to your environment.

What are your values for the following:
dumpcycle

dumpcycle 1 weeks       # the number of days in the normal dump cycle

runspercycle

runspercycle 5          # the number of amdump runs in dumpcycle days

(We only run weekdays.)

tapecycle x tapes

tapecycle 15 tapes # the number of tapes in rotation

(Exactly three weeks/dumpcycles worth.)

And don't forget:
runtapes 1 # number of tapes to be used in a single run of amdump

(We use one tape per night.)


So we rotate runspercycle * runtapes = 5 * 1 = 5 tapes off-site once per dumpcycle = 1 week. As I said before, we store the most recent set off-site as they are deemed the most valuable, and we don't restore too often. This has the side-effect of leaving the next dumpcycle worth of tapes on-site, so if you forget to switch things out, you still have the correct next tapes.

Cheers.

?
Ciao,
  ...David
--
// david lebel <lebel@{lebel.org,nobiaze.com,openbsd.org}> //
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Darin Dugan
System Administrator
Iowa State University Extension
[EMAIL PROTECTED]
http://www.extension.iastate.edu