[Veritas-bu] Architectural question (staging)

2010-04-25 Thread Victor Engle
Hello List, Just wanted to get some opinions about whether disk staging units are worthwhile. My backup server has two BasicDisk staging units with the storage units configured such that the data goes to disk and is then moved to tape. I have a tape library with four LTO-3 drives connected via

Re: [Veritas-bu] Architectural question (staging)

2010-04-25 Thread Ed Wilts
On Sun, Apr 25, 2010 at 2:14 PM, Victor Engle victor.en...@gmail.comwrote: Just wanted to get some opinions about whether disk staging units are worthwhile. My backup server has two BasicDisk staging units with the storage units configured such that the data goes to disk and is then moved to

Re: [Veritas-bu] Architectural question (staging)

2010-04-25 Thread William Brown
DSSUs are OK but not as useful as e.g. AdvancedDisk pools for staging. The algorithm for how it selects items to delete is very different. I think you need to turn the question on its head. Disk staging is not useful if your backups (including incremental) can always stream the drive. Ours