OSB Catalog Media Family Attributes

Question

Hi,
In the section about the Catalog Recovery Media Family Object, the OSB Admin Guide states that "Oracle recommends rotating backups across two volume sets", without actually saying how this might be done.
I have a backup window running from midnight to 6am, with the catalog backup taking place at midnight.
My assumption is that this rotation across two volume sets can be achieved by tweaking the write window and retain time of the OSB-CATALOG-MF media family to something like a 6 hour write window and a 24 hour retain time. Of course, I could extend the retain time out to a number of days so that I could have that many days of history, but by restricting the write window I can guarentee that I only have one catalog backup per volume set
Is my assumption correct, or is there some other way of achieving this?

Answer 1

Yes that's a way to do it. This way it will always use a new tape for the catalog backup, and those tapes will be kept for as long as you specify. Personally I keep one weeks worth of catalog backup tapes (so 7 tapes) just to be really safe against media problems.
So I use write window 1 day, keep volume set 6 days.