Technical Articles ID:
Last Modified: 5/6/2011
McAfee VirusScan Enterprise 8.7i
The On-Access and On-Demand scanners perform certain actions after a DAT update that can cause high CPU usage until they are complete.
Poor system performance after a DAT update.
Virus definition (DAT) files were updated.
In some cases after an update, EngineServer.exe and McShield.exe both attempt to create mferuntime.dat. Each process causes the other to enter a loop of retrying to create the file and encountering sharing violations. Each attempt to create mferuntime.dat requires reading the full DAT file set again.
NOTE:Mferuntime.dat is a memory mapped file that was introduced with Patch 1 for VirusScan Enterprise (VSE) 8.7i to assist in managing the size of the virus definition files. This file heps to maintain a smaller footprint in memory and improve scanning performance.
Patch 4 for VirusScan Enterprise 8.7i resolves this issue by changing the way the mferuntime.dat file is created.
NOTE: This issue exists only in this particular version of VirusScan Enterprise and does not exist in any other versions.