VSP One SDS Block consists of a storage cluster, a protection domain, fault domains, and storage nodes.
The internal configuration of VSP One SDS Block is shown following.
- Fault domain
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A group of storage nodes located in a single availability zone. In Single-AZ configuration, the number of fault domains is one, because the storage nodes comprising a storage cluster can only be located in a single Availability Zone. In Multi-AZ configuration, storage operation can continue even if the storage nodes in a fault domain collectively become abnormal, provided that another fault domain is normally operating.
For details about fault domains, see Settings for fault tolerance of user data and management functions (Multi-AZ configuration).
- Internode network
- Network of storage nodes. It is used to communicate user data and management information between storage nodes.
- Protection domain
- Configuration to limit the scope of impact in the event of a storage node failure, a network failure between storage nodes, and others. All you have to do is set the name in setup. The number of protection domains is fixed by 1.
- Spread placement group
- A group for EC2 instances, each deployed on different hardware in the AWS data center.
- For details about spread placement groups, see Settings for fault tolerance of user data and management functions (Single-AZ configuration) or Settings for fault tolerance of user data and management functions (Multi-AZ configuration).
- Storage cluster
- VSP One SDS Block refers to a collection of multiple storage nodes functioning together as a single virtual storage system.
- Storage node
- A generic name for EC2 instances that make up VSP One SDS Block and process groups of VSP One SDS Block software running on those EC2 instances. This node is set up by using the setup operation.