What happens if a backup from DPM to tape, using a third-party product, fails?
Does DPM know? Matheson: You have to reply on tools inherent in your tape backup product for that. There are three vendors providing the archive component for DPM — Yosemite Technologies, Computer Associates and CommVault. You will have to reply on their management console if the jobs failed. Veritas will have a Backup Exec agent for DPM, too. What is the limit on the number of snapshots? Why is there a limit? Matheson: It can take up to eight snapshots per day and a maximum of 64 per volume. If you took one per day, you could keep three months worth [of snapshots on DPM]. If you took three per day, you could keep one month. We did some research and found that 90% of recoveries happen within a month. Depending on what customers tell us, we will modify this. What happens to the old snapshot once it reaches the limit? Matheson: It’s a first-in first-out process. Recovery process Thinking about the recovery process, let’s say I have 10,000 files on DPM that I want to restore back to my f
