LVM Management and Disaster Recovery.pdf

LVM Management and Disaster Recovery.pdf

• 1.
  LVM Disaster Recovery
• 2.
  What is LVM? ●LVM (Logical Volume Manager) is a storage management technology in Linux. ● Key Features: ○ Create flexible disk layouts ○ Resize partitions without reboot ○ Use multiple disks as one storage unit
• 4.
  Disaster Recovery inLVM ● A process of restoring lost or corrupted LVM-based data ● Example Scenarios: ○ Accidental deletion of logical volumes ○ Filesystem corruption ○ Disk failure ● Goal: Bring the system back to a working state quickly
• 5.
  Why Do WeNeed LVM Recovery? ● Real-world Needs: ○ Business continuity ○ Minimize downtime ○ Avoid data loss ● Common Situations: ○ Admin error (e.g., lvremove) ○ Power outage or crash ○ Logical volume corruption
• 6.
  How Can WeRecover LVM Data? Two Main Recovery Approaches: 1. Logical Volume Recreation + Backup Restoration 2. Snapshot-Based Recovery (if snapshot was created beforehand)
• 7.
  Role of Backupsin Recovery ● Backups = Insurance for your data ● Without backup: Recovery becomes difficult or impossible. ● Backups help: ○ Restore deleted data ○ Rebuild from known-good state ○ Recover from corruption
• 8.
  LVM Snapshot ● Asnapshot is a read-only or read-write copy of a logical volume at a point in time. ● Think of it as a photo of your volume’s data — great for backup or testing. ● Useful for: ○ Quick backup ○ Safe updates ○ Testing without affecting original data
• 9.
  Benefits of LVMBackups ● Peace of mind during system updates or changes ● Faster disaster recovery ● Preserve file permissions and structure ● Minimal data loss ● Support for automation (cron, scripts)
• 10.
  Methods to BackupLVM Data 1. Full File Backup (Recommended): ● tar czvf backup.tar.gz /mountpoint ● Archives entire LV contents 2. Snapshot + Copy: ● Create snapshot: lvcreate -s ● Mount snapshot and back up data
• 11.
  Best Practices forLVM Backups ● Automate regular backups ● Store backups on external or remote systems ● Test restore process periodically ● Document recovery steps clearly
• 12.
  Use Case Example ●Scenario: Developer deletes the wrong LV by mistake. ● Without Backup: Lost critical files, long recovery time. ● With Backup: ○ Recreate LV structure ○ Restore with tar ○ Back online in minutes