Dell PowerEdge External Media System 1434 Improving NFS performance on HPC clu - Page 34

Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS Example on the client: [root@compute-0-0 ~]# mount -o vers=3 :/home/xfs A.6. Useful commands and references DFC 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 than last 10 events. 4. /opt/dell/fluidcache/bin/fldcstat is the utility to view and monitor DFC statistics. Check the 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 the server. 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 Storage Administration Guide. https://access.redhat.com/knowledge/docs/enUS/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/s2-nfs-nfs-firewallconfig.html Alternately, turn off the firewall. Ensure that your public and private interfaces are on a secure network and be aware of the security implications of turning off the firewall before implementing this alternative: [root@nfs-dfc ~]# service iptables stop; chkconfig iptables off A.7. Performance tuning on clients 1. For each client, add the following to /etc/sysctl.conf to increase the TCP receive memory buffer size # increasing the default TCP receive memory size net.ipv4.tcp_rmem = 4096 2621440 16777216 Activate the changes with sysctl -p. 2. Mount clients using NFS v3. A previous study reported that NFSv3 has dramatically better metadata create performance than NFS v4. This solution recommends NFS v3 except in cases where the security enhancements in NFS v4 are critical. [root@compute-0-0 ~]# mount -o vers=3 :/home/xfs 34