On Windows 2000 SP3 and later and Windows Server 2003, this alert occurs when staging files are regenerated in the staging directory. FRS deleted the files from the staging directory after the staging directory reached 90% of its size limit. FRS must regenerate the staging files before sending them to downstream partners, and this regeneration can negatively impact server performance.
This alert might also be generated after a server in a replica set has a D2 operation performed on it.
If a D2 was not performed on a server in the replica set, increase the size of the staging directory to avoid the need for FRS to purge and regenerate staging files. For sizing guidelines, see Adjust the Staging Directory Size Accordingly.