USING CHECKSUMS TO REDUCE THE WRITE LATENCY OF LOGGING

摘要

Techniques for reducing write latency when logging write operations are provided. In one embodiment, a computer system can receive a write operation originating from a storage client, where the write operation is directed to a data object stored on a nonvolatile storage of the computer system. The computer system can further calculate a checksum value based on the contents of the data object as modified by the write operation, and generate a log record for the write operation that includes the first checksum value and a pointer to a location of the data object on the nonvolatile storage. The computer system can then issue the write operation and a write of the log record concurrently to the nonvolatile storage, thereby reducing the latency incurred for the overall write/logging process before a write acknowledgement is sent to the storage client.

主权项

1. A method for reducing write latency when logging write operations, the method comprising:
receiving, by a computer system, a write operation originating from a storage client, the write operation being directed to a data object stored on a nonvolatile storage of the computer system; calculating, by the computer system, a first checksum value based on contents of the data object as modified by the write operation; generating, by the computer system, a log record for the write operation that includes the first checksum value and a pointer to a location of the data object on the nonvolatile storage; and issuing, by the computer system, the write operation and a write of the log record concurrently to the nonvolatile storage.