Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS34Example on the client:[root@compute-0-0 ~]# mount –o vers=3 :/home/xfsA.6. Useful commands and referencesDFC is installed in /opt/dell/fluidcache.1. fldc is the command-line utility to configure DFC. Use fldc –h for the flags available.2. To check status use fldc –-status.3. Check for fldc events with fldc –-events. Use fldc –-num= --events to see more thanlast 10 events.4. /opt/dell/fluidcache/bin/fldcstat is the utility to view and monitor DFC statistics. Checkthe fldcstat manual pages for options and descriptions of the statistics that are available.5. Dell OpenManage Server Administrator provides a GUI to configure, administer, and monitor theserver. Browse to https://localhost:1311 on the NFS server to see this GUI.6. Enable IP ports on both the cluster servers. The list of ports to be enabled is in the Red Hat StorageAdministration Guide.https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/s2-nfs-nfs-firewall-config.htmlAlternately, turn off the firewall. Ensure that your public and private interfaces are on a securenetwork and be aware of the security implications of turning off the firewall before implementingthis alternative:[root@nfs-dfc ~]# service iptables stop; chkconfig iptables offA.7. Performance tuning on clients1. For each client, add the following to /etc/sysctl.conf to increase the TCP receive memorybuffer size# increasing the default TCP receive memory sizenet.ipv4.tcp_rmem = 4096 2621440 16777216Activate the changes with sysctl -p.2. Mount clients using NFS v3. A previous study reported that NFSv3 has dramatically better metadatacreate performance than NFS v4. This solution recommends NFS v3 except in cases where thesecurity enhancements in NFS v4 are critical.[root@compute-0-0 ~]# mount –o vers=3 :/home/xfs
