When duplicate request cache (DRC) entries maintained by NFS-Ganesha server reaches the high watermark limit, the server tries to reclaim old entries which may still be in use. As a result, every time the server cannot reclaim an entry, it logs a warning. This may flood the log file at times if there are too many requests being processed.
Workaround: Increase the DRC limit by executing the following steps:
1) Edit the /run/gluster/shared_storage/nfs-ganesha/ganesha.conf file and add the following parameters in NFS_Core_Param block:
DRC_TCP_Hiwat = 1024; #default is 256
2) Restart the NFS-Ganesha process on all the nodes in the NFS-Ganesha cluster using the following command:
# systemctl restart nfs-ganesha
This decreases the chances of these warnings filling up the logs.