The CLFS_LSN structure identifies an individual record in a Common Log File System (CLFS) stream.
A 64-bit value that holds three pieces of information about a log record: container identifier, block offset, and record sequence number.
A container is a contiguous physical disk extent that serves as part of a CLFS log. A given CLFS log has several containers. Each container has several sector-aligned blocks, each of which holds a numbered sequence of records. A record can be identified by the triple (logical container identifier, block offset, record sequence number).