3.5.1 Matrix Server Administration Guide

Chapter 8: Configure MxFS-Linux 172
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Adjust the Tuning Parameters
To apply the parameter changes listed above, add the following entries to
the /etc/sysctl.conf file, which is read at system startup. Be sure to modify
the parameters on each node in the matrix.
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=4096 524288 16777216
net.ipv4.tcp_wmem=4096 524288 16777216
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_sack=0
net.core.rmem_default=524287
net.core.wmem_default=524287
net.core.optmem_max=524287
net.core.netdev_max_backlog=2500
To also adjust the parameters on the running system, issue the following
command, which reads the etc/sysctl.conf file.
# sysctl -p
The parameters are located in /proc as specified in the following table. To
verify your changes, run the cat command on the /proc location as in the
following example:
$ cat /proc/sys/net/ipv4/tcp_wmem
4096 524288 16777216
NFS server threads
When MxFS-Linux is installed, it sets the
number of threads to 32 in the /etc/sysconfig/nfs
file. (On Red Hat, the value is set via the
RPCNFSDCOUNT parameter. On SLES9, the
parameter is
USE_KERNEL_NFSD_NUMBER.)
432
Tuning Point OS Default
Recommended