Keep¶

The Keep storage system consists of data block read/write services, SDKs, and management agents.

The responsibilities of the Keep service are:

• Write data blocks
• When writing: ensure data integrity by comparing client-supplied MD5 digest to client-supplied data
• Read data blocks (subject to permission, which is determined by the system/metadata DB)
• Send read/write/error event logs to management agents

The responsibilities of the SDK are:

• When writing: split data into ≤64 MiB chunks
• When writing: encode directory trees as manifests
• When writing: write data to the desired number of nodes to achieve storage redundancy
• After writing: register a collection with Arvados
• When reading: parse manifests
• When reading: verify data integrity by comparing locator to MD5 digest of retrieved data