On 4/1/2011 2:56 AM, Alan Brown wrote:
> Randy Katz wrote:
>
>> I have a Full being created every month with a 3 Volume Retention and 
>> a Time of 60d then there should never be a time when
>> there is no Full before Diff/Incr's, right? 
>
> Correct, but with monthly fulls you should set the time to 90-100 days.
>
>> If I wanted a 180 day cycle then would want to extend that to the 
>> incrementals and
>> diffs as well, right?
>
> yes.
>
> When the volume carrying the oldest full backup expires, the 
> subsequent diffs/incrementals are useless but leaving them in place 
> won't hurt.
>
> If you prune them all out immediately there's a possibility that the 
> temporary increase in available volumes may result in you not spotting 
> a need for more tapes/disk space as overall usage creeps up, until you 
> need the things urgently. (It's a lot easier to purge a couple of 
> volumes close to expiry than to have to hold up backups while waiting 
> for more LTO5s to be delivered.)
>

Alan, thanks for your help, now if I could only get this good a response 
from the Linux-HA list (hehe), be well!

Regards,
Randy

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