Tier 0: No off-site data – Possibly no recovery
Tier 1: Data backup with no hot site
Tier 2: Data backup with a hot site
Tier 3: Electronic vaulting
Tier 4: Point-in-time copies
Tier 5: Transaction integrity
Tier 6: Zero or near-Zero data loss
Tier 7: Highly automated, business integrated solution
These tiers were proposed by Share Inc to help identify the various methods of recovering mission-critical computer systems as required to support business continuity.
Liebert Corporation lists 4 tiers of protection
| Your Tiers of Protection | ||||
| Class | Customer Value | Annual Downtime | 9's Availability |
|
| Tier 1 | Protect Hardware - Avoid Power Transients | 8.7 hours | (3) 99.9% | |
| Tier 2 | Preserve Data - Orderly Shutdown | 52 minutes | (4) 99.99% | |
| Tier 3 | Increase Uptime - System Critical to Business | 5.2 minutes - 31 seconds | (5-6) 99.9999% | |
| Tier 4 | Increase Uptime - System IS the Business | 3 to .31 seconds | (7-8) 99.999999% | |
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2 comments:
I have seen DR Recovery tiers defined from Tier 0 (most critical, no downtime) to Tier 5 (non-critical, defereable). The seven tiers describe it in the opposite order. Which is more prevalent?
It differs from organization to organization. At one of our clients, Tier 1 is most critical.
- Vikram
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