Patent attributes
A technique for controlling acceptance of host application data into a data log in a data storage system includes selectively accepting or refusing newly arriving host data into the data log based on a comparison between an oldest entry in the data log and an age threshold. The age threshold is dynamically updated based on system heuristics. As long as the oldest log entry is younger than the age threshold, the data log continues to accept newly arriving host application data, acknowledging IO requests to host applications as the data specified in those requests is entered into the log. However, when the oldest log entry is older than the age threshold, new log entries are temporarily refused entry into the data log. Instead, newly arriving data are placed in a pending list, where they are kept until the data log is again accepting new log entries.
