– May only need a short recovery or rollback based on:
• Journaling file systems or databases • Crash checkpoints
– Can execute the replication technique closer to present time
• More frequent replications
• Backup data has multiple recovery points
– May require considerable time to recover if:
• Searching through a series of tapes • Decompressing data • Restoring a corrupt catalog before recovery • Performing a Crash Recovery
– recovering from a specialized “Crash File” – implemented differently by different software vendors
Replicated images are ready to go whereas backup has multiple recovery points. We need to look at the 2 different architectures.
When we look at data replication techniques, we’re talking about disk based replication. So its either going to be In-system replication – snapshots and split mirrors Between sub-systems – remote mirroring