FAST Search operations are not working properly due to AntiVirus

In particular, regularly occurring events such as the following could impact the consistency\health of the index and tend to indicate that these files are being locked:

·         fileutils: delete_dir_sync(“%FASTSearch%\data\data_index\0\index_1394398129762671000\index_data”) failed after 30 attempts

·         index: Could not delete %FASTSearch%\data\data_index\0\index_1394398129762671000. Exception Unable to rename %FASTSearch%\data\data_index\0\index_1394398129762671000 to %FASTSearch%\data\data_index\0\index_1394398129762671000.1

·         indexer@ServerName: systemmsg: ft::hunter : None of the 1 replicas offer all the operations we need. The gap is 94407 - 132068892. Stopping indexer, manual recovery is necessary.

Solution:

Check Antivirus configuration: Anti-virus scans can disrupt FAST operation. There was evidence of antivirus scans in the Event Logs.  Please  verify that FAST folders are excluded from scanning