I have just setup Symantec Backup Exec 12 Rev 1364 on a Windows 2003 server (HP Proliant DL380 G5) and we are using an HP Storeageworks 1/8 G2 Autoloader. We are using Ultrium LTO4 tapes.
We run backups Monday Friday. M-F the tapes get rotated every 2 weeks. The Friday tapes get rotated every 4 weeks and the end of moth tapes get rotated one a year. Tapes are changed daily. M-T there are two tapes in each set and the Friday and end of month sets have 4 tapes. This capacity is fine for now; we are using roughly 60 % of capacity on most jobs.
My problem is that I do not fully understand the overwrite protection rules. I want to avoid having to respond OK, or setting up an automatic response for that. I seem to have accomplished that but now I am worried that as the data grows the jobs may go back and being overwriting the first tape in the set. Im thinking that if I set the overwrite protection to 24 hours that should do the trick. Problem is that there seems to be three areas where the overwrite protection can be set and I cant figure out which takes precedent and how they work together.
Given my tape rotation and the time it takes for the jobs to finish I set the overwrite protection on the media set that I created to 24 hours.
In Tools | Options | Job Defaults I set the Media Management, Media overwrite protection level to None.
One the job itself set to overwrite media.
Can someone explain this to me, with these settings am I in jeopardy of having the job go back to the first tape in the set and begin overwriting?