Short Description: Enable/Disable the RANDOM RW file flag
Programs and data can reside in the OS system cache even after they have been closed down. The OS looks in the system cache when opening a program or file. But this cache can result in performance problems with Domino. For performance reasons, Domino opens databases with a RANDOM flag (FILE_FLAG_RANDOM_ACCESS ). In Windows 2008 64-bit, this flag causes file blocks that are read to stay in the cache until the file is closed. Because Domino keeps files open in the Database Cache (dbcache) for performance reasons, it takes quite a long time until the cache is released. During a backup of a larger Domino server, the file-system cache can grow dramatically and cause performance issues.
There is a IBM Workaround in place and implemented in 8.5.3 and/or 8.5.2 FP3 via SPR # KBRN8AKKA9 via Disable_Random_RW_File_ATTR=1. But the best way to solve this issue is to install Windows 2008 R2 plus Microsoft hotfix 979149 as mentioned here.
Disable_Random_RW_File_ATTR=0 / 1