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| Gliffy Diagram | ||||||
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| # | Description |
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| 3 | Elastic IP addresses are public IP addresses that can be programmatically mapped between instances within a region. They are associated with the AWS account and not with a specific instance or lifetime of an instance. Elastic IP addresses can be used to work around host or availability zone failure by quickly remapping the address to just started. Reserved instances can help guarantee that such capacity is available in another zone. |
| 4 | Valuable data should never be stored only on instance storage without proper backups, replication, or the ability to re-create the data. Amazon Elastic Block Store(EBS) offers persistent off-instance storage volumes that are about an order of magnitude more durable than on-instance storage. EBS volumes are automatically replicated within a single availability zone. To increase durability further, point-in-time snapshots can be created to store data on volumes in Amazon S3, which is then replicated to multipleAZs. While EBS volumes are tied to a specifica AZ, snapshots are tied to the region. Using a snapshot, you can create ne EBS volumes in any of the AZs of the same region. This is an effective way to deal with disk failure or other host-level issues, as well as with problems affecting an AZ. Snapshots are incremental, so it is advisable to hold on to recent snapshots. |