Overwrite Protection Period and Append Period Times Advice
Hi folks,
We're in a situation where I currently need the daily differential backup media used and the set wiped each day. We have one full backup a week on a Friday and differentialson other week days, and space is extremely limited.
On the daily differentials I've set the OPP to 12 hours and AP to 0 Hours, so that each media can be overwritten every day. I set the OPP to 12 hours so that the media can be free to be overwritten after that time - am i right in thinking this? And the AP is set to 0 so that it can be overwritten.
Fridays full backups have a different set so thats set to OPP 2 days (as these only run once a week) and AP to 0 hours. So after two days the whole set is ready to be overwritten without appending.
I'd be grateful if someone could confirm whether this is ok?
Thanks,
Evren
yes it will, the default selection sequence for choosing an overwritable tape is:
- Scratch media
- Recyclable media in the targeted media set
- Recyclable media in any media set
- Imported media
The backup sets itself make no difference this is all about Overwriteable media which is purely media sets (at least as long as BE 2012 and disk storage is NOT involved)
Notice the 3rd line that I bolded.
Recyclable media means media which is already in a configured media set that is eligible for an overwrite (so already contains an older backup set).
You can change the order of the above by changing settings - but every single combination of settings always contains that 3rd line.