We have a 15 TB clustered file system. Our file change rate is relatively small so our incremental file agent backups take 20 minutes. We recently failed over to the secondary node. As a result the subsequent incremental backup has been running for a couple days.
Since this is set up as a cluster agent it should be using the Optimized Scan to scan for changes.
My question is does the USN change journal info stay with shared storage or is it having to scan everything from scratch. In simple terms should I alwats expect such a long incremental any time the cluster changes nodes?