Amazon S3: Durability and Availability
Amazon S3 (Simple Storage Service) is designed
for high durability and availability, making it ideal for storing critical
data. Here’s a breakdown:
1. Durability
Durability: 99.999999999% (11
9’s)
·
This means that if twtech stores 10 million objects, on average twtech may lose one object every 10,000
years.
·
Achieved through automatic replication across multiple facilities
within a region.
·
Data integrity is maintained using regular checksums and self-healing processes.
·
Designed for long-term storage of critical data like backups,
logs, and archives.
2. Availability
Availability varies slightly depending on the S3
storage class:
|
Storage Class |
Availability
SLA |
Use Case |
|
S3 Standard |
99.99% |
Frequently accessed data |
|
S3 Standard-IA |
99.9% |
Infrequently accessed data |
|
S3 One Zone-IA |
99.5% |
Infrequently accessed data in a single AZ |
|
S3 Glacier Instant Retrieval |
99.9% |
Archival data with milliseconds retrieval |
|
S3 Glacier Flexible Retrieval |
99.99% (durability) |
Archival data, minutes to hours retrieval |
|
S3 Glacier Deep Archive |
99.99% (durability) |
Long-term archival (12+ hours retrieval) |
3.
Key Differences
·
Durability
is about data loss prevention.
·
Availability
is about data access uptime.
·
Even if S3 is down temporarily (availability
issue), twtech data is not lost (durability is still maintained).
4. Best Practices
·
Use S3
Standard for mission-critical applications needing high
availability.
·
Enable S3
Versioning and Replication
for extra protection and disaster recovery.
·
Monitor with S3 Event Notifications
and CloudWatch
for operational insights.
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