| 摘要 |
Systems and methods for information storage replication are presented. In one embodiment a storage flow control method includes estimating in a primary data server what an outstanding request backlog trend is for a remote secondary data server; determining a relationship of an outstanding request backlog trend to a threshold; and notifying a client that the primary data server can not service additional requests if the trend exceeds the threshold. In one embodiment the estimating comprises: sampling a number of outstanding messages at a plurality of fixed time intervals; and determining if there is a trend in the number of outstanding messages over the plurality of fixed time intervals. It is appreciated the estimating can be performed in a variety of ways, (e.g., utilizing an average, a moving average, etc). Determining the trend can include determining if values monotonically increase. The estimating in the primary server can be performed without intruding on operations of the remote secondary data server. The primary data server and the secondary data server can have a variety of configurations (e.g., a mirrored configuration, a RAID5configuration, etc.). |
