Disaster recovery
1. Solution
Host layer: Cluster, replication, and mirroring
Network layer: Virtual gateway (VIS) replication and active-active
Storage layer: Remote replication, volume mirroring, and active-active
2. DR networking: Active/standby, active-active, and geo-redundant
3. DR Indexes
RPO: Recovery point target, which is the amount of data lost due to disasters.
RTO: Recovery time target, which indicates the duration from the time when a disaster occurs to the time when the disaster occurs.
Migration
1. Solution
Host layer: Volume mirroring, copy, and replication
Network layer: Storage virtualization gateway mirroring and replication
Storage layer: Remote replication, migration, virtualization+migration, and LUN copy
Backup
Components of the Backup System
Backup software
CS: Manages jobs, saves configurations, and provides GUIs.
MA: Backs up and restores data and manages backup media.
CA: Obtaining Backup Data
Backup network
LAN-BASE: Control flows and data flows are transmitted through the same network.
LAN-FREE: Control flows are transmitted over the LAN, data flows are transmitted over the SAN, and MAs are installed on the production server.
SERVER-FREE: Snapshot, NDMP, and SCSI-3
Backup media
Disk library, tape library, virtual tape library...
Backup server
Backup Type
Full backup: Back up all data each time.
Differential backup: The data backed up each time is based on the differential part of full backup.
Incremental backup: The data backed up each time is based on the difference in the last backup.
Backup period: Data storage duration. Data in the backup period can be restored on any day in the backup period.
